Added performance microbenchmarks

- Added "Performance" folders containing perf xunit tests to a number of highly-used libraries (determined by Usage data)
- Two sets of usage data from store apps; I added a test for every function used in more than 5% of the covered assemblies in both data sets.
- This is a first-round pass of the most highly used libraries and does not include: abstract classes, interfaces, or Attributes
- Created a static utility class for commonly used functions across perf tests, stored in src\Common\tests\Performance.
- These tests will run using ```msbuild /t:BuildAndTest /p:performance=true``` from the projects test directory
- Added conditional properties that check if v5.0 is installed on the user's computer when running perf tests. If it isn't, a detailed error is thrown with a link to a performance-test github page that I've also added.

68 files changed, 8671 insertions, 1221 deletions

diff --git a/Documentation/README.md b/Documentation/README.md
index cda8094b2b..049103e0db 100644
--- a/Documentation/README.md
+++ b/Documentation/README.md
@@ -23,6 +23,7 @@ Project Docs
 ============
 
 - [Developer Guide](project-docs/developer-guide.md)
+- [Performance Testing](project-docs/performance-tests.md)
 - [Project priorities](https://github.com/dotnet/coreclr/blob/master/Documentation/project-docs/project-priorities.md)
 - [Contributing to CoreFX](project-docs/contributing.md)
 - [Contributing to .NET Core](https://github.com/dotnet/coreclr/blob/master/Documentation/project-docs/contributing.md)
diff --git a/Documentation/project-docs/performance-tests.md b/Documentation/project-docs/performance-tests.md
new file mode 100644
index 0000000000..94d51718e7
--- /dev/null
+++ b/Documentation/project-docs/performance-tests.md
@@ -0,0 +1,20 @@
+Performance Tests
+======================
+
+This document contains instructions for building, running, and adding Performance tests. 
+
+Requirements
+--------------------
+
+To run performance tests, .NET portable v5.0 is required. This library is included in [the Visual Studio Community 2015 download](https://www.visualstudio.com/products/visual-studio-community-vs). To get the correct packages during installation, follow these steps after opening the installer:
+1. Select "Custom Installation" if no installation is present, or "Modify" otherwise
+2. Check the "Universal Windows App Development Tools" box under the "Windows and Web Development" menu
+3. Install
+
+Running the tests
+-----------
+Performance test files (if present) are stored within a library's ```tests/Performance``` directory and contain test methods that are all marked with a perf-specific *Benchmark* attribute. The performance tests will only be run if the ```performance``` property is set to ```true```.
+
+To build and run the tests using msbuild for only one project, run ```msbuild /t:BuildAndTest /p:Performance=true``` from the tests directory. If the v5.0 assemblies aren't installed on your system, an error will be raised and no tests will be run.
+
+Performance tests for all libraries can also be run using the build script in ```corefx```: ```./build.cmd /p:Performance=true```
diff --git a/dir.props b/dir.props
index bcc7741574..c1d95012d7 100644
--- a/dir.props
+++ b/dir.props
@@ -10,7 +10,7 @@
 
   <!-- Build Tools Versions -->
   <PropertyGroup>
-    <BuildToolsVersion>1.0.25-prerelease-00094</BuildToolsVersion>
+    <BuildToolsVersion>1.0.25-prerelease-00095</BuildToolsVersion>
     <DnxVersion>1.0.0-beta7</DnxVersion>
     <DnxPackageName Condition="'$(DnxPackageName)' == '' and '$(OsEnvironment)'!='Unix'">dnx-coreclr-win-x86.$(DnxVersion)</DnxPackageName>
     <DnxPackageName Condition="'$(DnxPackageName)' == '' and '$(OsEnvironment)'=='Unix'">dnx-mono.$(DnxVersion)</DnxPackageName>
@@ -261,6 +261,11 @@
     <MakePriExtensionPath>$(_WindowsPhoneKitBinPath)\x86\MrmEnvironmentExtDl.dll</MakePriExtensionPath>
     <MakePriExtensionPath_x64>$(_WindowsPhoneKitBinPath)\x64\MrmEnvironmentExtDl.dll</MakePriExtensionPath_x64>
   </PropertyGroup>
+  
+  <!-- Perf test setup - Required until v5.0 is mandatory across CoreFX-->
+  <PropertyGroup>
+    <RunPerfTestsForProject Condition="'$(Performance)' == 'true' and '$(OS)' == 'Windows_NT' and Exists('$(MSBuildProgramFiles32)\MSBuild\Microsoft\Portable\v5.0\Microsoft.Portable.CSharp.targets')" >true</RunPerfTestsForProject>
+  </PropertyGroup>
 
   <Import Project="$(RoslynPropsFile)"
           Condition="'$(UseRoslynCompiler)'=='true' and Exists('$(RoslynPropsFile)')" />
diff --git a/src/.nuget/packages.Unix.config b/src/.nuget/packages.Unix.config
index e32e4d5e61..78be606fc1 100644
--- a/src/.nuget/packages.Unix.config
+++ b/src/.nuget/packages.Unix.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.DotNet.BuildTools" version="1.0.25-prerelease-00094" />
+  <package id="Microsoft.DotNet.BuildTools" version="1.0.25-prerelease-00095" />
   <package id="Microsoft.DotNet.BuildTools.ApiTools" version="1.0.0-prerelease" />
   <package id="dnx-mono" version="1.0.0-beta7" />
   <package id="Microsoft.Net.ToolsetCompilers" version="1.0.0-rc3-20150510-01" />
diff --git a/src/.nuget/packages.Windows_NT.config b/src/.nuget/packages.Windows_NT.config
index f37502a829..30fb2cb983 100644
--- a/src/.nuget/packages.Windows_NT.config
+++ b/src/.nuget/packages.Windows_NT.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.DotNet.BuildTools" version="1.0.25-prerelease-00094" />
+  <package id="Microsoft.DotNet.BuildTools" version="1.0.25-prerelease-00095" />
   <package id="dnx-coreclr-win-x86" version="1.0.0-beta7" />
   <package id="Microsoft.DotNet.BuildTools.ApiTools" version="1.0.0-prerelease" />
 </packages>
diff --git a/src/Common/tests/Performance/PerfUtils.cs b/src/Common/tests/Performance/PerfUtils.cs
new file mode 100644
index 0000000000..60ab0ba427
--- /dev/null
+++ b/src/Common/tests/Performance/PerfUtils.cs
@@ -0,0 +1,42 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.IO;
+
+namespace System
+{
+    /// <summary>Static helper class for performance tests</summary>
+    public static class PerfUtils
+    {
+        private static Random rand = new Random(1234132);
+
+        /// <summary>
+        /// Helper method to create a string containing a number of random
+        /// characters equal to the specified length
+        /// </summary>
+        public static string CreateString(int length)
+        {
+            // Random is not thread safe and will cause intermittent thread deadlock if used without being locked
+            lock (rand)
+            {
+                byte[] bytes = new byte[length];
+                rand.NextBytes(bytes);
+                return System.Convert.ToBase64String(bytes);
+            }
+        }
+
+        /// <summary>Gets a test file full path that is associated with the call site.</summary>
+        /// <param name="index">An optional index value to use as a suffix on the file name.  Typically a loop index.</param>
+        /// <param name="memberName">The member name of the function calling this method.</param>
+        /// <param name="lineNumber">The line number of the function calling this method.</param>
+        public static string GetTestFilePath(int? index = null, [CallerMemberName] string memberName = null, [CallerLineNumber] int lineNumber = 0)
+        {
+            return Path.Combine(Path.GetTempPath(), string.Format(
+                index.HasValue ? "{0}_{1}_{2}_{3}" : "{0}_{1}_{2}",
+                memberName ?? "TestBase", lineNumber, Path.GetRandomFileName(), 
+                index.GetValueOrDefault()));
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/System.Collections.NonGeneric/tests/Performance/Perf.HashTable.cs b/src/System.Collections.NonGeneric/tests/Performance/Perf.HashTable.cs
new file mode 100644
index 0000000000..329f3d4f76
--- /dev/null
+++ b/src/System.Collections.NonGeneric/tests/Performance/Perf.HashTable.cs
@@ -0,0 +1,83 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Xunit;
+using Microsoft.Xunit.Performance;
+using System.Collections.Generic;
+
+namespace System.Collections.Tests
+{
+    public class Perf_HashTable
+    {
+        private static List<object[]> _testData;
+
+        public static IEnumerable<object[]> TestData()
+        {
+            if (_testData == null)
+            {
+                _testData = new List<object[]>();
+                _testData.Add(new object[] { CreateHashtable(100) });
+                _testData.Add(new object[] { CreateHashtable(1000) });
+            }
+            return _testData;
+        }
+
+        public static Hashtable CreateHashtable(int size)
+        {
+            Hashtable ht = new Hashtable();
+            for (int i = 0; i < size; i++)
+                ht.Add(PerfUtils.CreateString(50), PerfUtils.CreateString(50));
+            return ht;
+        }
+
+        [Benchmark]
+        public void ctor()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    new Hashtable(); new Hashtable(); new Hashtable(); new Hashtable(); new Hashtable();
+                    new Hashtable(); new Hashtable(); new Hashtable(); new Hashtable(); new Hashtable();
+                    new Hashtable(); new Hashtable(); new Hashtable(); new Hashtable(); new Hashtable();
+                    new Hashtable(); new Hashtable(); new Hashtable(); new Hashtable(); new Hashtable();
+                }
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void GetItem(Hashtable table)
+        {
+            object result;
+            string key = PerfUtils.CreateString(50);
+            table.Add(key, "value");
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    result = table[key]; result = table[key]; result = table[key]; result = table[key];
+                    result = table[key]; result = table[key]; result = table[key]; result = table[key];
+                    result = table[key]; result = table[key]; result = table[key]; result = table[key];
+                    result = table[key]; result = table[key]; result = table[key]; result = table[key];
+                }
+            }
+            table.Remove(key);
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void Add(Hashtable table)
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    table.Add("key1", "value"); table.Add("key2", "value"); table.Add("key3", "value");
+                    table.Add("key4", "value"); table.Add("key5", "value"); table.Add("key6", "value");
+                    table.Add("key7", "value"); table.Add("key8", "value"); table.Add("key9", "value");
+                }
+                for (int i = 1; i <= 9; i++)
+                    table.Remove("key" + i);
+            }
+        }
+    }
+}
diff --git a/src/System.Collections.NonGeneric/tests/System.Collections.NonGeneric.Tests.csproj b/src/System.Collections.NonGeneric/tests/System.Collections.NonGeneric.Tests.csproj
index bc1b2bccc1..7ae44d2f56 100644
--- a/src/System.Collections.NonGeneric/tests/System.Collections.NonGeneric.Tests.csproj
+++ b/src/System.Collections.NonGeneric/tests/System.Collections.NonGeneric.Tests.csproj
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
   <PropertyGroup>
@@ -9,6 +9,11 @@
     <AssemblyName>System.Collections.NonGeneric.Tests</AssemblyName>
     <ProjectGuid>{EE95AE39-845A-42D3-86D0-8065DBE56612}</ProjectGuid>
   </PropertyGroup>
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
   <!-- Default configurations to help VS understand the configurations -->
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
   </PropertyGroup>
@@ -147,6 +152,13 @@
       <Link>Common\System\Diagnostics\DebuggerAttributes.cs</Link>
     </Compile>
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.HashTable.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\src\System.Collections.NonGeneric.csproj">
       <Name>System.Collections.NonGeneric</Name>
@@ -156,4 +168,4 @@
     <None Include="project.json" />
   </ItemGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/src/System.Collections.NonGeneric/tests/project.json b/src/System.Collections.NonGeneric/tests/project.json
index 0c1bfa9441..50a9586f45 100644
--- a/src/System.Collections.NonGeneric/tests/project.json
+++ b/src/System.Collections.NonGeneric/tests/project.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "Microsoft.DotNet.xunit.performance": "1.0.0-*",
     "System.Collections": "4.0.10",
     "System.Console": "4.0.0-beta-*",
     "System.Diagnostics.Debug": "4.0.10",
@@ -12,7 +13,7 @@
     "System.Text.Encoding": "4.0.10",
     "System.Threading": "4.0.10",
     "System.Threading.Tasks": "4.0.10",
-    "xunit": "2.1.0-beta3-*",
+    "xunit": "2.1.0-rc1-*",
     "xunit.netcore.extensions": "1.0.0-prerelease-*"
   },
   "frameworks": {
diff --git a/src/System.Collections.NonGeneric/tests/project.lock.json b/src/System.Collections.NonGeneric/tests/project.lock.json
index b6f818d354..213ae609d2 100644
--- a/src/System.Collections.NonGeneric/tests/project.lock.json
+++ b/src/System.Collections.NonGeneric/tests/project.lock.json
@@ -3,6 +3,36 @@
   "version": 1,
   "targets": {
     "DNXCore,Version=v5.0": {
+      "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.Diagnostics.Debug": "4.0.10",
+          "System.Diagnostics.Tracing": "4.0.20",
+          "System.Globalization": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem": "4.0.0",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.10",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Text.Encoding": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Tasks": "4.0.10",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "2.1.0-rc1-build3168",
+          "xunit.extensibility.execution": "2.1.0-rc1-build3168"
+        },
+        "compile": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        }
+      },
       "System.Collections/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -15,7 +45,7 @@
           "lib/DNXCore50/System.Collections.dll": {}
         }
       },
-      "System.Console/4.0.0-beta-23311": {
+      "System.Console/4.0.0-beta-23316": {
         "type": "package",
         "dependencies": {
           "System.IO": "4.0.0",
@@ -37,6 +67,18 @@
           "lib/DNXCore50/System.Diagnostics.Debug.dll": {}
         }
       },
+      "System.Diagnostics.Tracing/4.0.20": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Diagnostics.Tracing.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Diagnostics.Tracing.dll": {}
+        }
+      },
       "System.Globalization/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -63,6 +105,42 @@
           "lib/DNXCore50/System.IO.dll": {}
         }
       },
+      "System.IO.FileSystem/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Resources.ResourceManager": "4.0.0",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Runtime.Handles": "4.0.0",
+          "System.Runtime.InteropServices": "4.0.20",
+          "System.Text.Encoding": "4.0.10",
+          "System.Text.Encoding.Extensions": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Overlapped": "4.0.0",
+          "System.Threading.Tasks": "4.0.10"
+        },
+        "compile": {
+          "ref/dotnet/System.IO.FileSystem.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.IO.FileSystem.dll": {}
+        }
+      },
+      "System.IO.FileSystem.Primitives/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.20"
+        },
+        "compile": {
+          "ref/dotnet/System.IO.FileSystem.Primitives.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/System.IO.FileSystem.Primitives.dll": {}
+        }
+      },
       "System.Linq/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -79,6 +157,25 @@
           "lib/dotnet/System.Linq.dll": {}
         }
       },
+      "System.Linq.Expressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Linq.Expressions.dll": {}
+        }
+      },
+      "System.ObjectModel/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.ObjectModel.dll": {}
+        }
+      },
       "System.Private.Uri/4.0.0": {
         "type": "package",
         "compile": {
@@ -102,6 +199,19 @@
           "lib/DNXCore50/System.Reflection.dll": {}
         }
       },
+      "System.Reflection.Extensions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Reflection.Extensions.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Reflection.Extensions.dll": {}
+        }
+      },
       "System.Reflection.Primitives/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -204,6 +314,28 @@
           "lib/DNXCore50/System.Text.Encoding.dll": {}
         }
       },
+      "System.Text.Encoding.Extensions/4.0.10": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0",
+          "System.Text.Encoding": "4.0.10"
+        },
+        "compile": {
+          "ref/dotnet/System.Text.Encoding.Extensions.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Text.Encoding.Extensions.dll": {}
+        }
+      },
+      "System.Text.RegularExpressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Text.RegularExpressions.dll": {}
+        }
+      },
       "System.Threading/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -217,6 +349,19 @@
           "lib/DNXCore50/System.Threading.dll": {}
         }
       },
+      "System.Threading.Overlapped/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Handles": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Threading.Overlapped.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Threading.Overlapped.dll": {}
+        }
+      },
       "System.Threading.Tasks/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -229,11 +374,11 @@
           "lib/DNXCore50/System.Threading.Tasks.dll": {}
         }
       },
-      "xunit/2.1.0-beta3-build3029": {
+      "xunit/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.assert": "[2.1.0-beta3-build3029]",
-          "xunit.core": "[2.1.0-beta3-build3029]"
+          "xunit.assert": "[2.1.0-rc1-build3168]",
+          "xunit.core": "[2.1.0-rc1-build3168]"
         }
       },
       "xunit.abstractions/2.0.0": {
@@ -245,49 +390,86 @@
           "lib/portable-net45+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.abstractions.dll": {}
         }
       },
-      "xunit.assert/2.1.0-beta3-build3029": {
+      "xunit.assert/2.1.0-rc1-build3168": {
         "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.ObjectModel": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Text.RegularExpressions": "4.0.0",
+          "System.Threading.Tasks": "4.0.0"
+        },
         "compile": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         },
         "runtime": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         }
       },
-      "xunit.core/2.1.0-beta3-build3029": {
+      "xunit.core/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.extensibility.core": "[2.1.0-beta3-build3029]",
-          "xunit.extensibility.execution": "[2.1.0-beta3-build3029]"
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.0",
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diff --git a/src/System.Collections/tests/Performance/Perf.Dictionary.cs b/src/System.Collections/tests/Performance/Perf.Dictionary.cs
new file mode 100644
index 0000000000..2709784a3f
--- /dev/null
+++ b/src/System.Collections/tests/Performance/Perf.Dictionary.cs
@@ -0,0 +1,203 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Collections.Generic;
+using Xunit;
+using Microsoft.Xunit.Performance;
+
+namespace System.Collections.Tests
+{
+    public class Perf_Dictionary
+    {
+        private static List<object[]> _testData;
+
+        /// <summary>
+        /// Yields several Dictionaries containing increasing amounts of string-string
+        /// pairs can be used as MemberData input to performance tests for Dictionary
+        /// </summary>
+        /// <remarks>Any changes made to the returned collections MUST be undone. Collections
+        /// used as MemberData are cached and reused in other perf tests.
+        /// </remarks>
+        public static List<object[]> TestData()
+        {
+            if (_testData == null)
+            {
+                _testData = new List<object[]>();
+                _testData.Add(new object[] { CreateDictionary(100) });
+                _testData.Add(new object[] { CreateDictionary(1000) });
+            }
+            return _testData;
+        }
+
+        /// <summary>
+        /// Creates a Dictionary of string-string with the specified number of pairs
+        /// </summary>
+        public static Dictionary<string, string> CreateDictionary(int size)
+        {
+            Dictionary<string, string> dict = new Dictionary<string, string>();
+            while (dict.Count < size)
+            {
+                string key = PerfUtils.CreateString(50);
+                while (dict.ContainsKey(key))
+                    key = PerfUtils.CreateString(50);
+                dict.Add(key, PerfUtils.CreateString(50));
+            }
+            return dict;
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void Add(Dictionary<string, string> dict)
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    dict.Add("key1", "string"); dict.Add("key2", "string"); dict.Add("key3", "string");
+                    dict.Add("key4", "string"); dict.Add("key5", "string"); dict.Add("key6", "string");
+                    dict.Add("key7", "string"); dict.Add("key8", "string"); dict.Add("key9", "string");
+                }
+                for (int i = 1; i <= 9; i++)
+                    Assert.True(dict.Remove("key" + i));
+            }
+        }
+
+        [Benchmark]
+        public void ctor()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    new Dictionary<int, string>(); new Dictionary<int, string>(); new Dictionary<int, string>();
+                    new Dictionary<int, string>(); new Dictionary<int, string>(); new Dictionary<int, string>();
+                    new Dictionary<int, string>(); new Dictionary<int, string>(); new Dictionary<int, string>();
+                }
+        }
+
+        [Benchmark]
+        [InlineData(0)]
+        [InlineData(1024)]
+        [InlineData(4096)]
+        [InlineData(16384)]
+        public void ctor_int(int size)
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    new Dictionary<int, string>(size); new Dictionary<int, string>(size); new Dictionary<int, string>(size);
+                    new Dictionary<int, string>(size); new Dictionary<int, string>(size); new Dictionary<int, string>(size);
+                    new Dictionary<int, string>(size); new Dictionary<int, string>(size); new Dictionary<int, string>(size);
+                }
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void GetItem(Dictionary<string, string> dict)
+        {
+            // Setup
+            string retrieved;
+            for (int i = 1; i <= 9; i++)
+                dict.Add("key" + i, "value");
+
+            // Actual perf testing
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    retrieved = dict["key1"]; retrieved = dict["key2"]; retrieved = dict["key3"];
+                    retrieved = dict["key4"]; retrieved = dict["key5"]; retrieved = dict["key6"];
+                    retrieved = dict["key7"]; retrieved = dict["key8"]; retrieved = dict["key9"];
+                }
+            }
+
+            // Teardown
+            for (int i = 1; i <= 9; i++)
+                dict.Remove("key" + i);
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void SetItem(Dictionary<string, string> dict)
+        {
+            // Setup
+            for (int i = 1; i <= 9; i++)
+                dict.Add("key" + i, "value");
+
+            // Actual perf testing
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    dict["key1"] = "string"; dict["key2"] = "string"; dict["key3"] = "string";
+                    dict["key4"] = "string"; dict["key5"] = "string"; dict["key6"] = "string";
+                    dict["key7"] = "string"; dict["key8"] = "string"; dict["key9"] = "string";
+                }
+            }
+
+            // Teardown
+            for (int i = 1; i <= 9; i++)
+                dict.Remove("key" + i);
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void GetKeys(Dictionary<string, string> dict)
+        {
+            IEnumerable<string> result;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    result = dict.Keys; result = dict.Keys; result = dict.Keys;
+                    result = dict.Keys; result = dict.Keys; result = dict.Keys;
+                    result = dict.Keys; result = dict.Keys; result = dict.Keys;
+                }
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void TryGetValue(Dictionary<string, string> dict)
+        {
+            // Setup
+            string retrieved;
+            string key = PerfUtils.CreateString(50);
+            dict.Add(key, "value");
+
+            // Actual perf testing
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    dict.TryGetValue(key, out retrieved); dict.TryGetValue(key, out retrieved);
+                    dict.TryGetValue(key, out retrieved); dict.TryGetValue(key, out retrieved);
+                    dict.TryGetValue(key, out retrieved); dict.TryGetValue(key, out retrieved);
+                    dict.TryGetValue(key, out retrieved); dict.TryGetValue(key, out retrieved);
+                }
+            }
+
+            // Teardown
+            dict.Remove(key);
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void ContainsKey(Dictionary<string, string> dict)
+        {
+            // Setup
+            string key = PerfUtils.CreateString(50);
+            dict.Add(key, "value");
+
+            // Actual perf testing
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    dict.ContainsKey(key); dict.ContainsKey(key); dict.ContainsKey(key);
+                    dict.ContainsKey(key); dict.ContainsKey(key); dict.ContainsKey(key);
+                    dict.ContainsKey(key); dict.ContainsKey(key); dict.ContainsKey(key);
+                    dict.ContainsKey(key); dict.ContainsKey(key); dict.ContainsKey(key);
+                }
+            }
+            dict.Remove(key);
+        }
+    }
+}
diff --git a/src/System.Collections/tests/Performance/Perf.List.cs b/src/System.Collections/tests/Performance/Perf.List.cs
new file mode 100644
index 0000000000..b872b2d974
--- /dev/null
+++ b/src/System.Collections/tests/Performance/Perf.List.cs
@@ -0,0 +1,166 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Collections.Generic;
+using Xunit;
+using Microsoft.Xunit.Performance;
+
+namespace System.Collections.Tests
+{
+    public class Perf_List
+    {
+        private static List<object[]> _testData;
+
+        /// <summary>
+        /// Yields several Lists containing increasing amounts of strings
+       ///  can be used as MemberData input to performance tests for Dictionary
+        /// </summary>
+        /// <remarks>Any changes made to the returned collections MUST be undone. Collections
+        /// used as MemberData are cached and reused in other perf tests.
+        /// </remarks>
+        public static List<object[]> TestData()
+        {
+            if (_testData == null)
+            {
+                _testData = new List<object[]>();
+                _testData.Add(new object[] { CreateList(100) });
+                _testData.Add(new object[] { CreateList(1000) });
+            }
+            return _testData;
+        }
+
+        /// <summary>
+        /// Creates a list containing a number of elements equal to the specified size
+        /// </summary>
+        public static List<object> CreateList(int size)
+        {
+            List<object> list = new List<object>();
+            for (int i = 0; i < size; i++)
+                list.Add(PerfUtils.CreateString(100));
+            return list;
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void Add(List<object> list)
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    list.Add("TestString1"); list.Add("TestString2"); list.Add("TestString3"); list.Add("TestString4");
+                    list.Add("TestString5"); list.Add("TestString6"); list.Add("TestString7"); list.Add("TestString8");
+                }
+                list.RemoveRange(list.Count - 8, 8);
+            }
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void AddRange(List<object> list)
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                List<object> emptyList = new List<object>();
+                using (iteration.StartMeasurement())
+                    emptyList.AddRange(list);
+            }
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void Clear(List<object> list)
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Create a local hard copy so that future iterations aren't affected
+                var copy = new List<object>(list);
+                using (iteration.StartMeasurement())
+                    copy.Clear();
+            }
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void Contains(List<object> list)
+        {
+            object contained = list[list.Count / 2];
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    list.Contains(contained); list.Contains(contained); list.Contains(contained); list.Contains(contained);
+                    list.Contains(contained); list.Contains(contained); list.Contains(contained); list.Contains(contained);
+                    list.Contains(contained); list.Contains(contained); list.Contains(contained); list.Contains(contained);
+                }
+        }
+
+        [Benchmark]
+        public void ctor()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    new List<object>(); new List<object>(); new List<object>(); new List<object>(); new List<object>();
+                    new List<object>(); new List<object>(); new List<object>(); new List<object>(); new List<object>();
+                    new List<object>(); new List<object>(); new List<object>(); new List<object>(); new List<object>();
+                }
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void ctor_IEnumerable(List<object> list)
+        {
+            var array = list.ToArray();
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    new List<object>(array);
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void GetCount(List<object> list)
+        {
+            int temp;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    temp = list.Count; temp = list.Count; temp = list.Count; temp = list.Count; temp = list.Count;
+                    temp = list.Count; temp = list.Count; temp = list.Count; temp = list.Count; temp = list.Count;
+                    temp = list.Count; temp = list.Count; temp = list.Count; temp = list.Count; temp = list.Count;
+                }
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void GetItem(List<object> list)
+        {
+            object temp;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    temp = list[50]; temp = list[50]; temp = list[50]; temp = list[50]; temp = list[50];
+                    temp = list[50]; temp = list[50]; temp = list[50]; temp = list[50]; temp = list[50];
+                    temp = list[50]; temp = list[50]; temp = list[50]; temp = list[50]; temp = list[50];
+                    temp = list[50]; temp = list[50]; temp = list[50]; temp = list[50]; temp = list[50];
+                }
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void Enumerator(List<object> list)
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    foreach (var element in list) { }
+        }
+
+        [Benchmark]
+        [MemberData("TestData")]
+        public void ToArray(List<object> list)
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    list.ToArray();
+        }
+    }
+}
diff --git a/src/System.Collections/tests/System.Collections.Tests.csproj b/src/System.Collections/tests/System.Collections.Tests.csproj
index d8edbe9918..f0654cde4a 100644
--- a/src/System.Collections/tests/System.Collections.Tests.csproj
+++ b/src/System.Collections/tests/System.Collections.Tests.csproj
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
   <PropertyGroup>
@@ -9,6 +9,11 @@
     <AssemblyName>System.Collections.Tests</AssemblyName>
     <RootNamespace>System.Collections.Tests</RootNamespace>
   </PropertyGroup>
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
   <!-- Default configurations to help VS understand the configurations -->
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
   </PropertyGroup>
@@ -143,8 +148,16 @@
       <Link>Common\System\Diagnostics\DebuggerAttributes.cs</Link>
     </Compile>
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.Dictionary.cs" />
+    <Compile Include="Performance\Perf.List.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <ItemGroup>
     <None Include="project.json" />
   </ItemGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/src/System.Collections/tests/project.json b/src/System.Collections/tests/project.json
index b846876820..09ac0994f4 100644
--- a/src/System.Collections/tests/project.json
+++ b/src/System.Collections/tests/project.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "Microsoft.DotNet.xunit.performance": "1.0.0-*",
     "System.Collections": "4.0.10",
     "System.Console": "4.0.0-beta-*",
     "System.Globalization": "4.0.10",
@@ -9,7 +10,7 @@
     "System.Runtime.Extensions": "4.0.10",
     "System.Threading": "4.0.10",
     "System.Threading.Tasks": "4.0.10",
-    "xunit": "2.1.0-beta3-*",
+    "xunit": "2.1.0-rc1-*",
     "xunit.netcore.extensions": "1.0.0-prerelease-*"
   },
   "frameworks": {
diff --git a/src/System.Collections/tests/project.lock.json b/src/System.Collections/tests/project.lock.json
index 88e6efd62e..965a91bb49 100644
--- a/src/System.Collections/tests/project.lock.json
+++ b/src/System.Collections/tests/project.lock.json
@@ -3,6 +3,36 @@
   "version": 1,
   "targets": {
     "DNXCore,Version=v5.0": {
+      "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.Diagnostics.Debug": "4.0.10",
+          "System.Diagnostics.Tracing": "4.0.20",
+          "System.Globalization": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem": "4.0.0",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.10",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Text.Encoding": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Tasks": "4.0.10",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "2.1.0-rc1-build3168",
+          "xunit.extensibility.execution": "2.1.0-rc1-build3168"
+        },
+        "compile": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        }
+      },
       "System.Collections/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -15,7 +45,7 @@
           "lib/DNXCore50/System.Collections.dll": {}
         }
       },
-      "System.Console/4.0.0-beta-23311": {
+      "System.Console/4.0.0-beta-23316": {
         "type": "package",
         "dependencies": {
           "System.IO": "4.0.0",
@@ -37,6 +67,18 @@
           "lib/DNXCore50/System.Diagnostics.Debug.dll": {}
         }
       },
+      "System.Diagnostics.Tracing/4.0.20": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Diagnostics.Tracing.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Diagnostics.Tracing.dll": {}
+        }
+      },
       "System.Globalization/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -63,6 +105,42 @@
           "lib/DNXCore50/System.IO.dll": {}
         }
       },
+      "System.IO.FileSystem/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Resources.ResourceManager": "4.0.0",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Runtime.Handles": "4.0.0",
+          "System.Runtime.InteropServices": "4.0.20",
+          "System.Text.Encoding": "4.0.10",
+          "System.Text.Encoding.Extensions": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Overlapped": "4.0.0",
+          "System.Threading.Tasks": "4.0.10"
+        },
+        "compile": {
+          "ref/dotnet/System.IO.FileSystem.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.IO.FileSystem.dll": {}
+        }
+      },
+      "System.IO.FileSystem.Primitives/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.20"
+        },
+        "compile": {
+          "ref/dotnet/System.IO.FileSystem.Primitives.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/System.IO.FileSystem.Primitives.dll": {}
+        }
+      },
       "System.Linq/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -79,6 +157,25 @@
           "lib/dotnet/System.Linq.dll": {}
         }
       },
+      "System.Linq.Expressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Linq.Expressions.dll": {}
+        }
+      },
+      "System.ObjectModel/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.ObjectModel.dll": {}
+        }
+      },
       "System.Private.Uri/4.0.0": {
         "type": "package",
         "compile": {
@@ -102,6 +199,19 @@
           "lib/DNXCore50/System.Reflection.dll": {}
         }
       },
+      "System.Reflection.Extensions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Reflection.Extensions.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Reflection.Extensions.dll": {}
+        }
+      },
       "System.Reflection.Primitives/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -204,6 +314,28 @@
           "lib/DNXCore50/System.Text.Encoding.dll": {}
         }
       },
+      "System.Text.Encoding.Extensions/4.0.10": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0",
+          "System.Text.Encoding": "4.0.10"
+        },
+        "compile": {
+          "ref/dotnet/System.Text.Encoding.Extensions.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Text.Encoding.Extensions.dll": {}
+        }
+      },
+      "System.Text.RegularExpressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Text.RegularExpressions.dll": {}
+        }
+      },
       "System.Threading/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -217,6 +349,19 @@
           "lib/DNXCore50/System.Threading.dll": {}
         }
       },
+      "System.Threading.Overlapped/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Handles": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Threading.Overlapped.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Threading.Overlapped.dll": {}
+        }
+      },
       "System.Threading.Tasks/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -229,11 +374,11 @@
           "lib/DNXCore50/System.Threading.Tasks.dll": {}
         }
       },
-      "xunit/2.1.0-beta3-build3029": {
+      "xunit/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.assert": "[2.1.0-beta3-build3029]",
-          "xunit.core": "[2.1.0-beta3-build3029]"
+          "xunit.assert": "[2.1.0-rc1-build3168]",
+          "xunit.core": "[2.1.0-rc1-build3168]"
         }
       },
       "xunit.abstractions/2.0.0": {
@@ -245,49 +390,86 @@
           "lib/portable-net45+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.abstractions.dll": {}
         }
       },
-      "xunit.assert/2.1.0-beta3-build3029": {
+      "xunit.assert/2.1.0-rc1-build3168": {
         "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.ObjectModel": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Text.RegularExpressions": "4.0.0",
+          "System.Threading.Tasks": "4.0.0"
+        },
         "compile": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         },
         "runtime": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         }
       },
-      "xunit.core/2.1.0-beta3-build3029": {
+      "xunit.core/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.extensibility.core": "[2.1.0-beta3-build3029]",
-          "xunit.extensibility.execution": "[2.1.0-beta3-build3029]"
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Threading.Tasks": "4.0.0",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "[2.1.0-rc1-build3168]",
+          "xunit.extensibility.execution": "[2.1.0-rc1-build3168]"
         }
       },
-      "xunit.extensibility.core/2.1.0-beta3-build3029": {
+      "xunit.extensibility.core/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
           "xunit.abstractions": "[2.0.0]"
         },
         "compile": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.core.dll": {}
+          "lib/dotnet/xunit.core.dll": {}
         },
         "runtime": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.core.dll": {},
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.runner.tdnet.dll": {},
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.runner.utility.desktop.dll": {}
+          "lib/dotnet/xunit.core.dll": {},
+          "lib/dotnet/xunit.runner.tdnet.dll": {},
+          "lib/dotnet/xunit.runner.utility.desktop.dll": {}
         }
       },
-      "xunit.extensibility.execution/2.1.0-beta3-build3029": {
+      "xunit.extensibility.execution/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.extensibility.core": "[2.1.0-beta3-build3029]"
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.IO": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Linq.Expressions": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Text.Encoding": "4.0.0",
+          "System.Threading": "4.0.0",
+          "System.Threading.Tasks": "4.0.0",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "[2.1.0-rc1-build3168]"
         },
         "compile": {
-          "lib/dnxcore50/xunit.execution.dnx.dll": {}
+          "lib/dotnet/xunit.execution.dotnet.dll": {}
         },
         "runtime": {
-          "lib/dnxcore50/xunit.execution.dnx.dll": {}
+          "lib/dotnet/xunit.execution.dotnet.dll": {}
         }
       },
-      "xunit.netcore.extensions/1.0.0-prerelease-00085": {
+      "xunit.netcore.extensions/1.0.0-prerelease-00090": {
         "type": "package",
         "dependencies": {
           "System.Diagnostics.Debug": "4.0.10",
@@ -315,6 +497,25 @@
     }
   },
   "libraries": {
+    "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+      "type": "package",
+      "sha512": "NCrgkMUcuMy3T5PY9kcBFpRyN/HrUyHsSxvdyq426iTZj2pG+6odaztW5BrQov3gPEXM5cPx4+64djl4sC8/nw==",
+      "files": [
+        "lib/dotnet/xunit.performance.core.dll",
+        "lib/dotnet/xunit.performance.core.pdb",
+        "lib/dotnet/xunit.performance.core.XML",
+        "lib/dotnet/xunit.performance.execution.dotnet.dll",
+        "lib/dotnet/xunit.performance.execution.dotnet.pdb",
+        "lib/net46/xunit.performance.core.dll",
+        "lib/net46/xunit.performance.core.pdb",
+        "lib/net46/xunit.performance.core.XML",
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       "System.Collections >= 4.0.10",
       "System.Console >= 4.0.0-beta-*",
       "System.Globalization >= 4.0.10",
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       "System.Threading >= 4.0.10",
       "System.Threading.Tasks >= 4.0.10",
-      "xunit >= 2.1.0-beta3-*",
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diff --git a/src/System.Diagnostics.Process/tests/Performance/Perf.Process.cs b/src/System.Diagnostics.Process/tests/Performance/Perf.Process.cs
new file mode 100644
index 0000000000..c084f720e6
--- /dev/null
+++ b/src/System.Diagnostics.Process/tests/Performance/Perf.Process.cs
@@ -0,0 +1,124 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Xunit;
+using Microsoft.Xunit.Performance;
+using System.IO;
+
+namespace System.Diagnostics.ProcessTests
+{
+    public class Perf_Process : ProcessTestBase
+    {
+        [Benchmark]
+        public void Kill()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (Process proc = CreateProcessInfinite())
+                {
+                    proc.Start();
+                    using (iteration.StartMeasurement())
+                        proc.Kill();
+                }
+            }
+        }
+
+        [Benchmark]
+        public void GetProcessesByName()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    Process.GetProcessesByName("1");
+        }
+
+        [Benchmark]
+        public void GetId()
+        {
+            int id;
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (Process proc = CreateProcess())
+                {
+                    proc.Start();
+                    using (iteration.StartMeasurement())
+                        id = proc.Id;
+                    proc.Kill();
+                }
+            }
+        }
+
+        [Benchmark]
+        public void Start()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (Process proc = CreateProcess())
+                {
+                    using (iteration.StartMeasurement())
+                    {
+                        proc.Start();
+                    }
+                    proc.Kill();
+                }
+        }
+
+        [Benchmark]
+        public void GetHasExited()
+        {
+            bool result;
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (Process proc = CreateProcess())
+                {
+                    proc.Start();
+                    using (iteration.StartMeasurement())
+                        result = proc.HasExited;
+                    proc.Kill();
+                }
+            }
+        }
+
+        [Benchmark]
+        public void GetExitCode()
+        {
+            int result;
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (Process proc = CreateProcess())
+                {
+                    proc.Start();
+                    proc.WaitForExit();
+                    using (iteration.StartMeasurement())
+                        result = proc.ExitCode;
+                }
+            }
+        }
+
+        [Benchmark]
+        public void GetStartInfo()
+        {
+            ProcessStartInfo result;
+            foreach (var iteration in Benchmark.Iterations)
+                using (Process proc = CreateProcess())
+                using (iteration.StartMeasurement())
+                    result = proc.StartInfo;
+        }
+
+        [Benchmark]
+        public void GetStandardOutput()
+        {
+            StreamReader result;
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (Process proc = CreateProcess())
+                {
+                    proc.StartInfo.RedirectStandardOutput = true;
+                    proc.Start();
+                    
+                    using (iteration.StartMeasurement())
+                        result = proc.StandardOutput;
+                    proc.Kill();
+                }
+            }
+        }
+    }
+}
diff --git a/src/System.Diagnostics.Process/tests/System.Diagnostics.Process.Tests.csproj b/src/System.Diagnostics.Process/tests/System.Diagnostics.Process.Tests.csproj
index 8464875b17..eb9e0883f8 100644
--- a/src/System.Diagnostics.Process/tests/System.Diagnostics.Process.Tests.csproj
+++ b/src/System.Diagnostics.Process/tests/System.Diagnostics.Process.Tests.csproj
@@ -11,6 +11,11 @@
     <NuGetPackageImportStamp>b62eec4b</NuGetPackageImportStamp>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
   <!-- Default configurations to help VS understand the configurations -->
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' " />
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' " />
@@ -36,6 +41,13 @@
     <Compile Include="ProcessWaitingTests.cs" />
     <Compile Include="XunitAssemblyAttributes.cs" />
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.Process.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <ItemGroup>
     <None Include="project.json" />
   </ItemGroup>
diff --git a/src/System.Diagnostics.Process/tests/project.json b/src/System.Diagnostics.Process/tests/project.json
index 881853ed99..d17832fa36 100644
--- a/src/System.Diagnostics.Process/tests/project.json
+++ b/src/System.Diagnostics.Process/tests/project.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "Microsoft.DotNet.xunit.performance": "1.0.0-*",
     "Microsoft.Win32.Primitives": "4.0.0",
     "Microsoft.Win32.Registry": "4.0.0-beta-*",
     "System.Collections": "4.0.10",
@@ -22,7 +23,7 @@
     "System.Threading.Tasks": "4.0.10",
     "System.Threading.Thread": "4.0.0-beta-*",
     "System.Threading.ThreadPool": "4.0.10-beta-*",
-    "xunit": "2.1.0-beta3-*",
+    "xunit": "2.1.0-rc1-*",
     "xunit.netcore.extensions": "1.0.0-prerelease-*"
   },
   "frameworks": {
diff --git a/src/System.Diagnostics.Process/tests/project.lock.json b/src/System.Diagnostics.Process/tests/project.lock.json
index 1098bcf5a3..99fcb9ab90 100644
--- a/src/System.Diagnostics.Process/tests/project.lock.json
+++ b/src/System.Diagnostics.Process/tests/project.lock.json
@@ -3,6 +3,36 @@
   "version": 1,
   "targets": {
     "DNXCore,Version=v5.0": {
+      "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.Diagnostics.Debug": "4.0.10",
+          "System.Diagnostics.Tracing": "4.0.20",
+          "System.Globalization": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem": "4.0.0",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.10",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Text.Encoding": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Tasks": "4.0.10",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "2.1.0-rc1-build3168",
+          "xunit.extensibility.execution": "2.1.0-rc1-build3168"
+        },
+        "compile": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        }
+      },
       "Microsoft.Win32.Primitives/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -16,7 +46,7 @@
           "lib/dotnet/Microsoft.Win32.Primitives.dll": {}
         }
       },
-      "Microsoft.Win32.Registry/4.0.0-beta-23311": {
+      "Microsoft.Win32.Registry/4.0.0-beta-23316": {
         "type": "package",
         "dependencies": {
           "System.Collections": "4.0.10",
@@ -46,7 +76,7 @@
           "lib/DNXCore50/System.Collections.dll": {}
         }
       },
-      "System.Console/4.0.0-beta-23311": {
+      "System.Console/4.0.0-beta-23316": {
         "type": "package",
         "dependencies": {
           "System.IO": "4.0.0",
@@ -68,6 +98,18 @@
           "lib/DNXCore50/System.Diagnostics.Debug.dll": {}
         }
       },
+      "System.Diagnostics.Tracing/4.0.20": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Diagnostics.Tracing.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Diagnostics.Tracing.dll": {}
+        }
+      },
       "System.Globalization/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -130,7 +172,7 @@
           "lib/dotnet/System.IO.FileSystem.Primitives.dll": {}
         }
       },
-      "System.IO.Pipes/4.0.0-beta-23311": {
+      "System.IO.Pipes/4.0.0-beta-23316": {
         "type": "package",
         "dependencies": {
           "System.IO": "4.0.10",
@@ -168,6 +210,25 @@
           "lib/dotnet/System.Linq.dll": {}
         }
       },
+      "System.Linq.Expressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Linq.Expressions.dll": {}
+        }
+      },
+      "System.ObjectModel/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.ObjectModel.dll": {}
+        }
+      },
       "System.Private.Uri/4.0.0": {
         "type": "package",
         "compile": {
@@ -281,7 +342,7 @@
           "lib/DNXCore50/System.Runtime.InteropServices.dll": {}
         }
       },
-      "System.Runtime.InteropServices.RuntimeInformation/4.0.0-beta-23311": {
+      "System.Runtime.InteropServices.RuntimeInformation/4.0.0-beta-23316": {
         "type": "package",
         "dependencies": {
           "System.Resources.ResourceManager": "4.0.0",
@@ -325,7 +386,7 @@
           "lib/dotnet/System.Security.Principal.dll": {}
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@@ -1650,7 +1965,7 @@
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-      "xunit >= 2.1.0-beta3-*",
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diff --git a/src/System.Globalization/tests/Performance/Perf.CultureInfo.cs b/src/System.Globalization/tests/Performance/Perf.CultureInfo.cs
new file mode 100644
index 0000000000..9a0ae96dc0
--- /dev/null
+++ b/src/System.Globalization/tests/Performance/Perf.CultureInfo.cs
@@ -0,0 +1,37 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Xunit;
+using Microsoft.Xunit.Performance;
+
+namespace System.Globalization.Tests
+{
+    public class Perf_CultureInfo
+    {
+        [Benchmark]
+        public void GetCurrentCulture()
+        {
+            CultureInfo result;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    result = CultureInfo.CurrentCulture; result = CultureInfo.CurrentCulture; result = CultureInfo.CurrentCulture;
+                    result = CultureInfo.CurrentCulture; result = CultureInfo.CurrentCulture; result = CultureInfo.CurrentCulture;
+                    result = CultureInfo.CurrentCulture; result = CultureInfo.CurrentCulture; result = CultureInfo.CurrentCulture;
+                }
+        }
+
+        [Benchmark]
+        public void GetInvariantCulture()
+        {
+            CultureInfo result;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    result = CultureInfo.InvariantCulture; result = CultureInfo.InvariantCulture; result = CultureInfo.InvariantCulture;
+                    result = CultureInfo.InvariantCulture; result = CultureInfo.InvariantCulture; result = CultureInfo.InvariantCulture;
+                    result = CultureInfo.InvariantCulture; result = CultureInfo.InvariantCulture; result = CultureInfo.InvariantCulture;
+                }
+        }
+    }
+}
diff --git a/src/System.Globalization/tests/System.Globalization.Tests.csproj b/src/System.Globalization/tests/System.Globalization.Tests.csproj
index c53eb15f18..f0b4b1c42f 100644
--- a/src/System.Globalization/tests/System.Globalization.Tests.csproj
+++ b/src/System.Globalization/tests/System.Globalization.Tests.csproj
@@ -10,6 +10,11 @@
     <AssemblyName>System.Globalization.Tests</AssemblyName>
     <RestorePackages>true</RestorePackages>
   </PropertyGroup>
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
   <!-- Default configurations to help VS understand the configurations -->
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
   </PropertyGroup>
@@ -170,6 +175,14 @@
     <Compile Include="UnicodeCategory\UnicodeCategoryTests.cs" />
     <Compile Include="$(CommonTestPath)\System\RandomDataGenerator.cs" />
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.CultureInfo.cs" />
+    <Compile Include="Performance\Perf.StringBuilder.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <ItemGroup>
     <None Include="project.json" />
   </ItemGroup>
diff --git a/src/System.Globalization/tests/project.json b/src/System.Globalization/tests/project.json
index 2b8aa8b70f..c267839ac3 100644
--- a/src/System.Globalization/tests/project.json
+++ b/src/System.Globalization/tests/project.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
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index a989b32e4e..fecf8fedac 100644
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+++ b/src/System.Globalization/tests/project.lock.json
@@ -3,6 +3,36 @@
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         "xunit.netcore.extensions.nuspec"
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       "System.AppContext >= 4.0.0",
       "System.Console >= 4.0.0-beta-*",
       "System.Globalization >= 4.0.10",
@@ -1100,7 +1647,7 @@
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       "System.Threading.Tasks >= 4.0.10",
-      "xunit >= 2.1.0-beta3-*",
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diff --git a/src/System.IO.Compression/tests/Performance/Perf.DeflateStream.cs b/src/System.IO.Compression/tests/Performance/Perf.DeflateStream.cs
new file mode 100644
index 0000000000..58102a7ad6
--- /dev/null
+++ b/src/System.IO.Compression/tests/Performance/Perf.DeflateStream.cs
@@ -0,0 +1,118 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Xunit;
+using Microsoft.Xunit.Performance;
+using System.Collections.Generic;
+using System.Security.Cryptography;
+
+namespace System.IO.Compression.Tests
+{
+    public class Perf_DeflateStream
+    {
+        private static List<object[]> _compressedFiles;
+        private static List<object[]> _byteArraysToCompress;
+
+        /// <summary>
+        /// Yields an Enumerable list of paths to GZTestData files
+        /// </summary>
+        public static IEnumerable<object[]> CompressedFiles()
+        {
+            if (_compressedFiles == null)
+            {
+                _compressedFiles = new List<object[]>();
+                // Crypto random data
+                byte[] bytes = new byte[100000000];
+                var rand = RandomNumberGenerator.Create();
+                rand.GetBytes(bytes);
+                string filePath = PerfUtils.GetTestFilePath() + ".gz";
+                using (FileStream output = File.Create(filePath))
+                using (GZipStream zip = new GZipStream(output, CompressionMode.Compress))
+                    zip.Write(bytes, 0, bytes.Length);
+                _compressedFiles.Add(new object[] { filePath });
+
+                // Create a compressed file with repeated segments
+                bytes = Text.Encoding.UTF8.GetBytes(PerfUtils.CreateString(100000));
+                filePath = PerfUtils.GetTestFilePath() + ".gz";
+                using (FileStream output = File.Create(filePath))
+                using (GZipStream zip = new GZipStream(output, CompressionMode.Compress))
+                    for (int i = 0; i < 1000; i++)
+                        zip.Write(bytes, 0, bytes.Length);
+                _compressedFiles.Add(new object[] { filePath });
+            }
+            return _compressedFiles;
+        }
+
+        // Creates byte arrays that contain random data to be compressed
+        public static IEnumerable<object[]> ByteArraysToCompress()
+        {
+            if (_byteArraysToCompress == null)
+            {
+                _byteArraysToCompress = new List<object[]>();
+
+                // Regular, semi well formed data
+                _byteArraysToCompress.Add(new object[] { Text.Encoding.UTF8.GetBytes(PerfUtils.CreateString(100000000)) });
+
+                // Crypto random data
+                {
+                    byte[] bytes = new byte[100000000];
+                    var rand = RandomNumberGenerator.Create();
+                    rand.GetBytes(bytes);
+                    _byteArraysToCompress.Add(new object[] { bytes });
+                }
+
+                // Highly repeated data
+                {
+                    byte[] bytes = new byte[101000000];
+                    byte[] small = Text.Encoding.UTF8.GetBytes(PerfUtils.CreateString(100000));
+                    for (int i = 0; i < 1000; i++)
+                        small.CopyTo(bytes, 100000 * i);
+                    _byteArraysToCompress.Add(new object[] { bytes });
+                }
+            }
+            return _byteArraysToCompress;
+        }
+
+        [Benchmark]
+        [MemberData("CompressedFiles")]
+        public async void Decompress(string testFilePath)
+        {
+            int _bufferSize = 1024;
+            int retCount = -1;
+            var bytes = new byte[_bufferSize];
+            using (MemoryStream gzStream = await LocalMemoryStream.readAppFileAsync(testFilePath))
+            using (MemoryStream strippedMs = StripHeaderAndFooter.Strip(gzStream))
+            {
+                foreach (var iteration in Benchmark.Iterations)
+                {
+                    using (DeflateStream zip = new DeflateStream(strippedMs, CompressionMode.Decompress, leaveOpen: true))
+                    using (iteration.StartMeasurement())
+                    {
+                        while (retCount != 0)
+                        {
+                            retCount = zip.Read(bytes, 0, _bufferSize);
+                        }
+                    }
+                    strippedMs.Seek(0, SeekOrigin.Begin);
+                }
+             }
+        }
+
+        [Benchmark]
+        [MemberData("ByteArraysToCompress")]
+        public void Compress(byte[] bytes)
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                string filePath = PerfUtils.GetTestFilePath();
+                using (FileStream output = File.Create(filePath))
+                using (DeflateStream zip = new DeflateStream(output, CompressionMode.Compress))
+                using (iteration.StartMeasurement())
+                {
+                    zip.Write(bytes, 0, bytes.Length);
+                }
+                File.Delete(filePath);
+            }
+        }
+    }
+}
diff --git a/src/System.IO.Compression/tests/System.IO.Compression.Tests.csproj b/src/System.IO.Compression/tests/System.IO.Compression.Tests.csproj
index 1badbd51ca..317cfb8079 100644
--- a/src/System.IO.Compression/tests/System.IO.Compression.Tests.csproj
+++ b/src/System.IO.Compression/tests/System.IO.Compression.Tests.csproj
@@ -8,6 +8,11 @@
     <OutputType>Library</OutputType>
     <AssemblyName>System.IO.Compression.Tests</AssemblyName>
   </PropertyGroup>
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|AnyCPU'" />
   <ItemGroup>
@@ -48,6 +53,13 @@
       <Link>Common\Compression\Utilities\ZipTestHelper.cs</Link>
     </Compile>
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.DeflateStream.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
   <!-- Temporary until we have new work in build tools to
        deploy content from nuget packages -->
diff --git a/src/System.IO.Compression/tests/project.json b/src/System.IO.Compression/tests/project.json
index c8de6d2531..aabb023460 100644
--- a/src/System.IO.Compression/tests/project.json
+++ b/src/System.IO.Compression/tests/project.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "Microsoft.DotNet.xunit.performance": "1.0.0-*",
     "System.Collections": "4.0.10",
     "System.Console": "4.0.0-beta-*",
     "System.Diagnostics.Debug": "4.0.10",
@@ -13,12 +14,13 @@
     "System.Runtime.Handles": "4.0.0",
     "System.Runtime.InteropServices": "4.0.20",
     "System.Runtime.InteropServices.RuntimeInformation": "4.0.0-beta-*",
+    "System.Security.Cryptography.Algorithms": "4.0.0-beta-*",
     "System.Text.Encoding": "4.0.10",
     "System.Threading.Overlapped": "4.0.0",
     "System.Threading.Tasks": "4.0.10",
     "System.Threading.ThreadPool": "4.0.10-beta-*",
     "System.IO.Compression.TestData": "1.0.0-prerelease",
-    "xunit": "2.1.0-beta3-*",
+    "xunit": "2.1.0-rc1-*",
     "xunit.netcore.extensions": "1.0.0-prerelease-*"
   },
   "frameworks": {
diff --git a/src/System.IO.Compression/tests/project.lock.json b/src/System.IO.Compression/tests/project.lock.json
index 059de03419..272c23898c 100644
--- a/src/System.IO.Compression/tests/project.lock.json
+++ b/src/System.IO.Compression/tests/project.lock.json
@@ -3,6 +3,36 @@
   "version": 1,
   "targets": {
     "DNXCore,Version=v5.0": {
+      "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.Diagnostics.Debug": "4.0.10",
+          "System.Diagnostics.Tracing": "4.0.20",
+          "System.Globalization": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem": "4.0.0",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.10",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Text.Encoding": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Tasks": "4.0.10",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "2.1.0-rc1-build3168",
+          "xunit.extensibility.execution": "2.1.0-rc1-build3168"
+        },
+        "compile": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        }
+      },
       "System.Collections/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -15,7 +45,7 @@
           "lib/DNXCore50/System.Collections.dll": {}
         }
       },
-      "System.Console/4.0.0-beta-23311": {
+      "System.Console/4.0.0-beta-23321": {
         "type": "package",
         "dependencies": {
           "System.IO": "4.0.0",
@@ -37,6 +67,18 @@
           "lib/DNXCore50/System.Diagnostics.Debug.dll": {}
         }
       },
+      "System.Diagnostics.Tracing/4.0.20": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Diagnostics.Tracing.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Diagnostics.Tracing.dll": {}
+        }
+      },
       "System.Globalization/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -138,6 +180,25 @@
           "lib/dotnet/System.Linq.dll": {}
         }
       },
+      "System.Linq.Expressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Linq.Expressions.dll": {}
+        }
+      },
+      "System.ObjectModel/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.ObjectModel.dll": {}
+        }
+      },
       "System.Private.Uri/4.0.0": {
         "type": "package",
         "compile": {
@@ -161,6 +222,19 @@
           "lib/DNXCore50/System.Reflection.dll": {}
         }
       },
+      "System.Reflection.Extensions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Reflection.Extensions.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Reflection.Extensions.dll": {}
+        }
+      },
       "System.Reflection.Primitives/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -238,17 +312,42 @@
           "lib/DNXCore50/System.Runtime.InteropServices.dll": {}
         }
       },
-      "System.Runtime.InteropServices.RuntimeInformation/4.0.0-beta-23311": {
+      "System.Runtime.InteropServices.RuntimeInformation/4.0.0-beta-23321": {
         "type": "package",
         "dependencies": {
-          "System.Resources.ResourceManager": "4.0.0",
-          "System.Runtime": "4.0.20"
+          "System.Runtime": "4.0.0"
         },
         "compile": {
           "ref/dotnet/System.Runtime.InteropServices.RuntimeInformation.dll": {}
+        }
+      },
+      "System.Security.Cryptography.Algorithms/4.0.0-beta-23321": {
+        "type": "package",
+        "dependencies": {
+          "System.IO": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Security.Cryptography.Primitives": "4.0.0-beta-23321"
+        },
+        "compile": {
+          "ref/dotnet/System.Security.Cryptography.Algorithms.dll": {}
+        }
+      },
+      "System.Security.Cryptography.Primitives/4.0.0-beta-23321": {
+        "type": "package",
+        "dependencies": {
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.IO": "4.0.10",
+          "System.Resources.ResourceManager": "4.0.0",
+          "System.Runtime": "4.0.20",
+          "System.Threading": "4.0.0",
+          "System.Threading.Tasks": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Security.Cryptography.Primitives.dll": {}
         },
         "runtime": {
-          "lib/dotnet/System.Runtime.InteropServices.RuntimeInformation.dll": {}
+          "lib/dotnet/System.Security.Cryptography.Primitives.dll": {}
         }
       },
       "System.Text.Encoding/4.0.10": {
@@ -276,6 +375,15 @@
           "lib/DNXCore50/System.Text.Encoding.Extensions.dll": {}
         }
       },
+      "System.Text.RegularExpressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Text.RegularExpressions.dll": {}
+        }
+      },
       "System.Threading/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -314,7 +422,7 @@
           "lib/DNXCore50/System.Threading.Tasks.dll": {}
         }
       },
-      "System.Threading.ThreadPool/4.0.10-beta-23311": {
+      "System.Threading.ThreadPool/4.0.10-beta-23321": {
         "type": "package",
         "dependencies": {
           "System.Runtime": "4.0.0",
@@ -327,11 +435,11 @@
           "lib/DNXCore50/System.Threading.ThreadPool.dll": {}
         }
       },
-      "xunit/2.1.0-beta3-build3029": {
+      "xunit/2.1.0-rc1-build3168": {
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         "dependencies": {
-          "xunit.assert": "[2.1.0-beta3-build3029]",
-          "xunit.core": "[2.1.0-beta3-build3029]"
+          "xunit.assert": "[2.1.0-rc1-build3168]",
+          "xunit.core": "[2.1.0-rc1-build3168]"
         }
       },
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@@ -343,49 +451,86 @@
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         }
       },
-      "xunit.assert/2.1.0-beta3-build3029": {
+      "xunit.assert/2.1.0-rc1-build3168": {
         "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.ObjectModel": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Text.RegularExpressions": "4.0.0",
+          "System.Threading.Tasks": "4.0.0"
+        },
         "compile": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         },
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-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
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-      "xunit.core/2.1.0-beta3-build3029": {
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-          "xunit.extensibility.execution": "[2.1.0-beta3-build3029]"
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+          "System.Linq": "4.0.0",
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+          "System.Reflection.Extensions": "4.0.0",
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+          "System.IO": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Linq.Expressions": "4.0.0",
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+          "System.Reflection.Extensions": "4.0.0",
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       "System.Collections >= 4.0.10",
       "System.Console >= 4.0.0-beta-*",
       "System.Diagnostics.Debug >= 4.0.10",
@@ -2239,12 +2960,13 @@
       "System.Runtime.Handles >= 4.0.0",
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       "System.Text.Encoding >= 4.0.10",
       "System.Threading.Overlapped >= 4.0.0",
       "System.Threading.Tasks >= 4.0.10",
       "System.Threading.ThreadPool >= 4.0.10-beta-*",
       "System.IO.Compression.TestData >= 1.0.0-prerelease",
-      "xunit >= 2.1.0-beta3-*",
+      "xunit >= 2.1.0-rc1-*",
       "xunit.netcore.extensions >= 1.0.0-prerelease-*"
     ],
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diff --git a/src/System.IO.FileSystem/tests/Performance/Perf.Directory.cs b/src/System.IO.FileSystem/tests/Performance/Perf.Directory.cs
new file mode 100644
index 0000000000..413bc9fccd
--- /dev/null
+++ b/src/System.IO.FileSystem/tests/Performance/Perf.Directory.cs
@@ -0,0 +1,63 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+
+namespace System.IO.FileSystem.Tests
+{
+    public class Perf_Directory
+    {
+        [Benchmark]
+        public void GetCurrentDirectory()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    Directory.GetCurrentDirectory(); Directory.GetCurrentDirectory(); Directory.GetCurrentDirectory();
+                    Directory.GetCurrentDirectory(); Directory.GetCurrentDirectory(); Directory.GetCurrentDirectory();
+                    Directory.GetCurrentDirectory(); Directory.GetCurrentDirectory(); Directory.GetCurrentDirectory();
+                }
+            }
+        }
+
+        [Benchmark]
+        public void CreateDirectory()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Setup
+                string testFile = PerfUtils.GetTestFilePath();
+
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                    Directory.CreateDirectory(testFile);
+
+                // Teardown
+                Directory.Delete(testFile);
+            }
+        }
+
+        [Benchmark]
+        public void Exists()
+        {
+            // Setup
+            string testFile = PerfUtils.GetTestFilePath();
+            Directory.CreateDirectory(testFile);
+
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                {
+                    Directory.Exists(testFile); Directory.Exists(testFile); Directory.Exists(testFile);
+                    Directory.Exists(testFile); Directory.Exists(testFile); Directory.Exists(testFile);
+                    Directory.Exists(testFile); Directory.Exists(testFile); Directory.Exists(testFile);
+                }
+            }
+
+            // Teardown
+            Directory.Delete(testFile);
+        }
+    }
+}
diff --git a/src/System.IO.FileSystem/tests/Performance/Perf.File.cs b/src/System.IO.FileSystem/tests/Performance/Perf.File.cs
new file mode 100644
index 0000000000..c0edc031c6
--- /dev/null
+++ b/src/System.IO.FileSystem/tests/Performance/Perf.File.cs
@@ -0,0 +1,49 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+
+namespace System.IO.FileSystem.Tests
+{
+    public class Perf_File
+    {
+        [Benchmark]
+        public void Exists()
+        {
+            // Setup
+            string testFile = PerfUtils.GetTestFilePath();
+            File.Create(testFile).Dispose();
+
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                {
+                    File.Exists(testFile); File.Exists(testFile); File.Exists(testFile);
+                    File.Exists(testFile); File.Exists(testFile); File.Exists(testFile);
+                    File.Exists(testFile); File.Exists(testFile); File.Exists(testFile);
+                }
+            }
+
+            // Teardown
+            File.Delete(testFile);
+        }
+
+        [Benchmark]
+        public void Delete()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Setup
+                string testFile = PerfUtils.GetTestFilePath();
+                File.Create(testFile + 1).Dispose(); File.Create(testFile + 2).Dispose(); File.Create(testFile + 3).Dispose();
+
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                {
+                    File.Delete(testFile + 1); File.Delete(testFile + 2); File.Delete(testFile + 3);
+                }
+            }
+        }
+    }
+}
diff --git a/src/System.IO.FileSystem/tests/Performance/Perf.FileInfo.cs b/src/System.IO.FileSystem/tests/Performance/Perf.FileInfo.cs
new file mode 100644
index 0000000000..64b5276669
--- /dev/null
+++ b/src/System.IO.FileSystem/tests/Performance/Perf.FileInfo.cs
@@ -0,0 +1,25 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+
+namespace System.IO.FileSystem.Tests
+{
+    public class Perf_FileInfo
+    {
+        [Benchmark]
+        public void ctor_str()
+        {
+            string path = PerfUtils.GetTestFilePath();
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    new FileInfo(path); new FileInfo(path); new FileInfo(path);
+                    new FileInfo(path); new FileInfo(path); new FileInfo(path);
+                    new FileInfo(path); new FileInfo(path); new FileInfo(path);
+                }
+            }
+        }
+    }
+}
diff --git a/src/System.IO.FileSystem/tests/System.IO.FileSystem.Tests.csproj b/src/System.IO.FileSystem/tests/System.IO.FileSystem.Tests.csproj
index 49aec22928..9d4514cc27 100644
--- a/src/System.IO.FileSystem/tests/System.IO.FileSystem.Tests.csproj
+++ b/src/System.IO.FileSystem/tests/System.IO.FileSystem.Tests.csproj
@@ -9,6 +9,11 @@
     <AssemblyName>System.IO.FileSystem.Tests</AssemblyName>
     <TestCategories>InnerLoop;OuterLoop</TestCategories>
   </PropertyGroup>
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
     <DebugSymbols>true</DebugSymbols>
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -28,7 +33,6 @@
       <Name>System.IO.FileSystem</Name>
       <Private>True</Private>
     </ProjectReference>
-
     <!-- 
       Until an updated packages is published, temporarily copy the locally built System.Runtime.Extensions library
       but still reference the contract from the package for compiling.  
@@ -165,5 +169,14 @@
       <Link>Common\System\IO\FileCleanupTestBase.cs</Link>
     </Compile>
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.Directory.cs" />
+    <Compile Include="Performance\Perf.File.cs" />
+    <Compile Include="Performance\Perf.FileInfo.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
+</Project>
\ No newline at end of file
diff --git a/src/System.IO.FileSystem/tests/project.json b/src/System.IO.FileSystem/tests/project.json
index 96e940b630..19c4e373c8 100644
--- a/src/System.IO.FileSystem/tests/project.json
+++ b/src/System.IO.FileSystem/tests/project.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "Microsoft.DotNet.xunit.performance": "1.0.0-*",
     "System.Collections": "4.0.10",
     "System.Console": "4.0.0-beta-*",
     "System.Diagnostics.Debug": "4.0.10",
@@ -18,7 +19,7 @@
     "System.Threading.Overlapped": "4.0.0",
     "System.Threading.Tasks": "4.0.10",
     "System.Threading.ThreadPool": "4.0.10-beta-*",
-    "xunit": "2.1.0-beta3-*",
+    "xunit": "2.1.0-rc1-*",
     "xunit.netcore.extensions": "1.0.0-prerelease-*"
   },
   "frameworks": {
diff --git a/src/System.IO.FileSystem/tests/project.lock.json b/src/System.IO.FileSystem/tests/project.lock.json
index df3a5ddf0c..cade0983e3 100644
--- a/src/System.IO.FileSystem/tests/project.lock.json
+++ b/src/System.IO.FileSystem/tests/project.lock.json
@@ -3,6 +3,36 @@
   "version": 1,
   "targets": {
     "DNXCore,Version=v5.0": {
+      "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.Diagnostics.Debug": "4.0.10",
+          "System.Diagnostics.Tracing": "4.0.20",
+          "System.Globalization": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem": "4.0.0",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.10",
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-        "xunit.netcore.extensions.1.0.0-prerelease-00085.nupkg",
-        "xunit.netcore.extensions.1.0.0-prerelease-00085.nupkg.sha512",
+        "xunit.netcore.extensions.1.0.0-prerelease-00090.nupkg",
+        "xunit.netcore.extensions.1.0.0-prerelease-00090.nupkg.sha512",
         "xunit.netcore.extensions.nuspec"
       ]
     }
   },
   "projectFileDependencyGroups": {
     "": [
+      "Microsoft.DotNet.xunit.performance >= 1.0.0-*",
       "System.Collections >= 4.0.10",
       "System.Console >= 4.0.0-beta-*",
       "System.Diagnostics.Debug >= 4.0.10",
@@ -1271,7 +1690,7 @@
       "System.Threading.Overlapped >= 4.0.0",
       "System.Threading.Tasks >= 4.0.10",
       "System.Threading.ThreadPool >= 4.0.10-beta-*",
-      "xunit >= 2.1.0-beta3-*",
+      "xunit >= 2.1.0-rc1-*",
       "xunit.netcore.extensions >= 1.0.0-prerelease-*"
     ],
     "DNXCore,Version=v5.0": []
diff --git a/src/System.Runtime.Extensions/tests/Performance/Perf.Environment.cs b/src/System.Runtime.Extensions/tests/Performance/Perf.Environment.cs
new file mode 100644
index 0000000000..298c43398c
--- /dev/null
+++ b/src/System.Runtime.Extensions/tests/Performance/Perf.Environment.cs
@@ -0,0 +1,68 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+using System.Runtime.InteropServices;
+
+namespace System.Runtime.Extensions.Tests
+{
+    public class Perf_Environment
+    {
+        [Benchmark]
+        public void GetEnvironmentVariable()
+        {
+            string env = PerfUtils.CreateString(15);
+            try
+            {
+                // setup the environment variable so we can read it
+                Environment.SetEnvironmentVariable(env, "value");
+
+                // read the valid environment variable for the test
+                foreach (var iteration in Benchmark.Iterations)
+                {
+                    using (iteration.StartMeasurement())
+                    {
+                        Environment.GetEnvironmentVariable(env); Environment.GetEnvironmentVariable(env); Environment.GetEnvironmentVariable(env);
+                        Environment.GetEnvironmentVariable(env); Environment.GetEnvironmentVariable(env); Environment.GetEnvironmentVariable(env);
+                        Environment.GetEnvironmentVariable(env); Environment.GetEnvironmentVariable(env); Environment.GetEnvironmentVariable(env);
+                    }
+                }
+            }
+            finally
+            {
+                // clear the variable that we set
+                Environment.SetEnvironmentVariable(env, null);
+            }
+        }
+
+        [Benchmark]
+        public void ExpandEnvironmentVariables()
+        {
+            string env = PerfUtils.CreateString(15);
+            string inputEnv = "%" + env + "%";
+            try
+            {
+                // setup the environment variable so we can read it
+                Environment.SetEnvironmentVariable(env, "value");
+
+                // read the valid environment variable
+                foreach (var iteration in Benchmark.Iterations)
+                {
+                    using (iteration.StartMeasurement())
+                    {
+                        Environment.ExpandEnvironmentVariables(inputEnv); Environment.ExpandEnvironmentVariables(inputEnv);
+                        Environment.ExpandEnvironmentVariables(inputEnv); Environment.ExpandEnvironmentVariables(inputEnv);
+                        Environment.ExpandEnvironmentVariables(inputEnv); Environment.ExpandEnvironmentVariables(inputEnv);
+                        Environment.ExpandEnvironmentVariables(inputEnv); Environment.ExpandEnvironmentVariables(inputEnv);
+                        Environment.ExpandEnvironmentVariables(inputEnv); Environment.ExpandEnvironmentVariables(inputEnv);
+                    }
+                }
+            }
+            finally
+            {
+                // clear the variable that we set
+                Environment.SetEnvironmentVariable(env, null);
+            }
+        }
+    }
+}
diff --git a/src/System.Runtime.Extensions/tests/Performance/Perf.Path.cs b/src/System.Runtime.Extensions/tests/Performance/Perf.Path.cs
new file mode 100644
index 0000000000..b7a0746507
--- /dev/null
+++ b/src/System.Runtime.Extensions/tests/Performance/Perf.Path.cs
@@ -0,0 +1,60 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.IO;
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Extensions.Tests
+{
+    public class Perf_Path
+    {
+        [Benchmark]
+        public void Combine()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Setup
+                string testPath1 = PerfUtils.GetTestFilePath();
+                string testPath2 = PerfUtils.CreateString(10);
+
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                {
+                    Path.Combine(testPath1, testPath2); Path.Combine(testPath1, testPath2); Path.Combine(testPath1, testPath2);
+                    Path.Combine(testPath1, testPath2); Path.Combine(testPath1, testPath2); Path.Combine(testPath1, testPath2);
+                    Path.Combine(testPath1, testPath2); Path.Combine(testPath1, testPath2); Path.Combine(testPath1, testPath2);
+                }
+            }
+        }
+
+        [Benchmark]
+        public void GetFileName()
+        {
+            string testPath = PerfUtils.GetTestFilePath();
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    Path.GetFileName(testPath); Path.GetFileName(testPath); Path.GetFileName(testPath);
+                    Path.GetFileName(testPath); Path.GetFileName(testPath); Path.GetFileName(testPath);
+                    Path.GetFileName(testPath); Path.GetFileName(testPath); Path.GetFileName(testPath);
+                }
+            }
+        }
+
+        [Benchmark]
+        public void GetDirectoryName()
+        {
+            string testPath = PerfUtils.GetTestFilePath();
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    Path.GetDirectoryName(testPath); Path.GetDirectoryName(testPath); Path.GetDirectoryName(testPath);
+                    Path.GetDirectoryName(testPath); Path.GetDirectoryName(testPath); Path.GetDirectoryName(testPath);
+                    Path.GetDirectoryName(testPath); Path.GetDirectoryName(testPath); Path.GetDirectoryName(testPath);
+                }
+            }
+        }
+    }
+}
diff --git a/src/System.Runtime.Extensions/tests/Performance/Perf.Random.cs b/src/System.Runtime.Extensions/tests/Performance/Perf.Random.cs
new file mode 100644
index 0000000000..9c58a42fa8
--- /dev/null
+++ b/src/System.Runtime.Extensions/tests/Performance/Perf.Random.cs
@@ -0,0 +1,53 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.IO;
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Extensions.Tests
+{
+    public class Perf_Random
+    {
+        [Benchmark]
+        public void ctor()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    new Random(); new Random(); new Random();
+                    new Random(); new Random(); new Random();
+                    new Random(); new Random(); new Random();
+                }
+        }
+
+        [Benchmark]
+        public void Next_int()
+        {
+            Random rand = new Random(123456);
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    rand.Next(10000); rand.Next(10000); rand.Next(10000);
+                    rand.Next(10000); rand.Next(10000); rand.Next(10000);
+                    rand.Next(10000); rand.Next(10000); rand.Next(10000);
+                }
+            }
+        }
+
+        [Benchmark]
+        public void Next_int_int()
+        {
+            Random rand = new Random(123456);
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    rand.Next(100, 10000); rand.Next(100, 10000); rand.Next(100, 10000);
+                    rand.Next(100, 10000); rand.Next(100, 10000); rand.Next(100, 10000);
+                    rand.Next(100, 10000); rand.Next(100, 10000); rand.Next(100, 10000);
+                }
+            }
+        }
+    }
+}
diff --git a/src/System.Runtime.Extensions/tests/System.Runtime.Extensions.Tests.csproj b/src/System.Runtime.Extensions/tests/System.Runtime.Extensions.Tests.csproj
index 4b490995d7..5fa51579c7 100644
--- a/src/System.Runtime.Extensions/tests/System.Runtime.Extensions.Tests.csproj
+++ b/src/System.Runtime.Extensions/tests/System.Runtime.Extensions.Tests.csproj
@@ -11,6 +11,11 @@
     <RestorePackages>true</RestorePackages>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
   <!-- Default configurations to help VS understand the configurations -->
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
   </PropertyGroup>
@@ -55,6 +60,15 @@
     <Compile Include="System\Random.cs" />
     <Compile Include="System\StringComparer.cs" />
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.Environment.cs" />
+    <Compile Include="Performance\Perf.Path.cs" />
+    <Compile Include="Performance\Perf.Random.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <ItemGroup>
     <None Include="project.json" />
   </ItemGroup>
diff --git a/src/System.Runtime.Extensions/tests/project.json b/src/System.Runtime.Extensions/tests/project.json
index 7dd267d86b..fb4ca0514c 100644
--- a/src/System.Runtime.Extensions/tests/project.json
+++ b/src/System.Runtime.Extensions/tests/project.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "Microsoft.DotNet.xunit.performance": "1.0.0-*",
     "System.Console": "4.0.0-beta-*",
     "System.IO.FileSystem": "4.0.0",
     "System.Globalization": "4.0.10",
@@ -9,7 +10,7 @@
     "System.Runtime.InteropServices.RuntimeInformation": "4.0.0-beta-*",
     "System.Threading": "4.0.10",
     "System.Threading.Tasks": "4.0.10",
-    "xunit": "2.1.0-beta3-*",
+    "xunit": "2.1.0-rc1-*",
     "xunit.netcore.extensions": "1.0.0-prerelease-*"
   },
   "frameworks": {
diff --git a/src/System.Runtime.Extensions/tests/project.lock.json b/src/System.Runtime.Extensions/tests/project.lock.json
index 13a48165c0..558d6a5605 100644
--- a/src/System.Runtime.Extensions/tests/project.lock.json
+++ b/src/System.Runtime.Extensions/tests/project.lock.json
@@ -3,6 +3,36 @@
   "version": 1,
   "targets": {
     "DNXCore,Version=v5.0": {
+      "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.Diagnostics.Debug": "4.0.10",
+          "System.Diagnostics.Tracing": "4.0.20",
+          "System.Globalization": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem": "4.0.0",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.10",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Text.Encoding": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Tasks": "4.0.10",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "2.1.0-rc1-build3168",
+          "xunit.extensibility.execution": "2.1.0-rc1-build3168"
+        },
+        "compile": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        }
+      },
       "System.Collections/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -15,7 +45,7 @@
           "lib/DNXCore50/System.Collections.dll": {}
         }
       },
-      "System.Console/4.0.0-beta-23311": {
+      "System.Console/4.0.0-beta-23316": {
         "type": "package",
         "dependencies": {
           "System.IO": "4.0.0",
@@ -37,6 +67,18 @@
           "lib/DNXCore50/System.Diagnostics.Debug.dll": {}
         }
       },
+      "System.Diagnostics.Tracing/4.0.20": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Diagnostics.Tracing.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Diagnostics.Tracing.dll": {}
+        }
+      },
       "System.Globalization/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -115,6 +157,25 @@
           "lib/dotnet/System.Linq.dll": {}
         }
       },
+      "System.Linq.Expressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Linq.Expressions.dll": {}
+        }
+      },
+      "System.ObjectModel/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.ObjectModel.dll": {}
+        }
+      },
       "System.Private.Uri/4.0.0": {
         "type": "package",
         "compile": {
@@ -138,6 +199,19 @@
           "lib/DNXCore50/System.Reflection.dll": {}
         }
       },
+      "System.Reflection.Extensions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Reflection.Extensions.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Reflection.Extensions.dll": {}
+        }
+      },
       "System.Reflection.Primitives/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -215,7 +289,7 @@
           "lib/DNXCore50/System.Runtime.InteropServices.dll": {}
         }
       },
-      "System.Runtime.InteropServices.RuntimeInformation/4.0.0-beta-23311": {
+      "System.Runtime.InteropServices.RuntimeInformation/4.0.0-beta-23316": {
         "type": "package",
         "dependencies": {
           "System.Resources.ResourceManager": "4.0.0",
@@ -253,6 +327,15 @@
           "lib/DNXCore50/System.Text.Encoding.Extensions.dll": {}
         }
       },
+      "System.Text.RegularExpressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Text.RegularExpressions.dll": {}
+        }
+      },
       "System.Threading/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -291,11 +374,11 @@
           "lib/DNXCore50/System.Threading.Tasks.dll": {}
         }
       },
-      "xunit/2.1.0-beta3-build3029": {
+      "xunit/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.assert": "[2.1.0-beta3-build3029]",
-          "xunit.core": "[2.1.0-beta3-build3029]"
+          "xunit.assert": "[2.1.0-rc1-build3168]",
+          "xunit.core": "[2.1.0-rc1-build3168]"
         }
       },
       "xunit.abstractions/2.0.0": {
@@ -307,49 +390,86 @@
           "lib/portable-net45+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.abstractions.dll": {}
         }
       },
-      "xunit.assert/2.1.0-beta3-build3029": {
+      "xunit.assert/2.1.0-rc1-build3168": {
         "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.ObjectModel": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Text.RegularExpressions": "4.0.0",
+          "System.Threading.Tasks": "4.0.0"
+        },
         "compile": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         },
         "runtime": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         }
       },
-      "xunit.core/2.1.0-beta3-build3029": {
+      "xunit.core/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.extensibility.core": "[2.1.0-beta3-build3029]",
-          "xunit.extensibility.execution": "[2.1.0-beta3-build3029]"
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Threading.Tasks": "4.0.0",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "[2.1.0-rc1-build3168]",
+          "xunit.extensibility.execution": "[2.1.0-rc1-build3168]"
         }
       },
-      "xunit.extensibility.core/2.1.0-beta3-build3029": {
+      "xunit.extensibility.core/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
           "xunit.abstractions": "[2.0.0]"
         },
         "compile": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.core.dll": {}
+          "lib/dotnet/xunit.core.dll": {}
         },
         "runtime": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.core.dll": {},
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.runner.tdnet.dll": {},
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.runner.utility.desktop.dll": {}
+          "lib/dotnet/xunit.core.dll": {},
+          "lib/dotnet/xunit.runner.tdnet.dll": {},
+          "lib/dotnet/xunit.runner.utility.desktop.dll": {}
         }
       },
-      "xunit.extensibility.execution/2.1.0-beta3-build3029": {
+      "xunit.extensibility.execution/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.extensibility.core": "[2.1.0-beta3-build3029]"
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.IO": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Linq.Expressions": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Text.Encoding": "4.0.0",
+          "System.Threading": "4.0.0",
+          "System.Threading.Tasks": "4.0.0",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "[2.1.0-rc1-build3168]"
         },
         "compile": {
-          "lib/dnxcore50/xunit.execution.dnx.dll": {}
+          "lib/dotnet/xunit.execution.dotnet.dll": {}
         },
         "runtime": {
-          "lib/dnxcore50/xunit.execution.dnx.dll": {}
+          "lib/dotnet/xunit.execution.dotnet.dll": {}
         }
       },
-      "xunit.netcore.extensions/1.0.0-prerelease-00085": {
+      "xunit.netcore.extensions/1.0.0-prerelease-00090": {
         "type": "package",
         "dependencies": {
           "System.Diagnostics.Debug": "4.0.10",
@@ -377,6 +497,25 @@
     }
   },
   "libraries": {
+    "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+      "type": "package",
+      "sha512": "NCrgkMUcuMy3T5PY9kcBFpRyN/HrUyHsSxvdyq426iTZj2pG+6odaztW5BrQov3gPEXM5cPx4+64djl4sC8/nw==",
+      "files": [
+        "lib/dotnet/xunit.performance.core.dll",
+        "lib/dotnet/xunit.performance.core.pdb",
+        "lib/dotnet/xunit.performance.core.XML",
+        "lib/dotnet/xunit.performance.execution.dotnet.dll",
+        "lib/dotnet/xunit.performance.execution.dotnet.pdb",
+        "lib/net46/xunit.performance.core.dll",
+        "lib/net46/xunit.performance.core.pdb",
+        "lib/net46/xunit.performance.core.XML",
+        "lib/net46/xunit.performance.execution.desktop.dll",
+        "lib/net46/xunit.performance.execution.desktop.pdb",
+        "Microsoft.DotNet.xunit.performance.1.0.0-alpha-build0014.nupkg",
+        "Microsoft.DotNet.xunit.performance.1.0.0-alpha-build0014.nupkg.sha512",
+        "Microsoft.DotNet.xunit.performance.nuspec"
+      ]
+    },
     "System.Collections/4.0.10": {
       "type": "package",
       "serviceable": true,
@@ -411,10 +550,10 @@
         "System.Collections.nuspec"
       ]
     },
-    "System.Console/4.0.0-beta-23311": {
+    "System.Console/4.0.0-beta-23316": {
       "type": "package",
       "serviceable": true,
-      "sha512": "aCYId/+628/CuOEBKx7sGxQ9fpqvLDqkOMuc0rqWRUCAIgNLtLd5htaQo58aXjzrP8D4/X35xVC+PQoHHis4Mg==",
+      "sha512": "pYDflUHKD2oIllR+HsbgfkbwNsjivEgYsFjM3eZWS6KVqa5vYVMl93OvC+WfB0Va3Q9gAZYzxXQJUv6gWoJGLw==",
       "files": [
         "lib/MonoAndroid10/_._",
         "lib/MonoTouch10/_._",
@@ -428,8 +567,8 @@
         "ref/xamarinios10/_._",
         "ref/xamarinmac20/_._",
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-        "xunit.extensibility.execution.2.1.0-beta3-build3029.nupkg.sha512",
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+        "lib/dnx451/xunit.execution.dotnet.pdb",
+        "lib/dnx451/xunit.execution.dotnet.xml",
+        "lib/dotnet/xunit.execution.dotnet.dll",
+        "lib/dotnet/xunit.execution.dotnet.pdb",
+        "lib/dotnet/xunit.execution.dotnet.xml",
+        "lib/monoandroid/xunit.execution.dotnet.dll",
+        "lib/monoandroid/xunit.execution.dotnet.pdb",
+        "lib/monoandroid/xunit.execution.dotnet.xml",
+        "lib/monotouch/xunit.execution.dotnet.dll",
+        "lib/monotouch/xunit.execution.dotnet.pdb",
+        "lib/monotouch/xunit.execution.dotnet.xml",
+        "lib/net35/xunit.execution.desktop.dll",
+        "lib/net35/xunit.execution.desktop.pdb",
+        "lib/net35/xunit.execution.desktop.xml",
+        "lib/portable-net45+win8+wp8+wpa81/xunit.execution.dotnet.dll",
+        "lib/portable-net45+win8+wp8+wpa81/xunit.execution.dotnet.pdb",
+        "lib/portable-net45+win8+wp8+wpa81/xunit.execution.dotnet.xml",
+        "lib/win8/xunit.execution.dotnet.dll",
+        "lib/win8/xunit.execution.dotnet.pdb",
+        "lib/win8/xunit.execution.dotnet.xml",
+        "lib/wp8/xunit.execution.dotnet.dll",
+        "lib/wp8/xunit.execution.dotnet.pdb",
+        "lib/wp8/xunit.execution.dotnet.xml",
+        "lib/wpa81/xunit.execution.dotnet.dll",
+        "lib/wpa81/xunit.execution.dotnet.pdb",
+        "lib/wpa81/xunit.execution.dotnet.xml",
+        "lib/xamarinios/xunit.execution.dotnet.dll",
+        "lib/xamarinios/xunit.execution.dotnet.pdb",
+        "lib/xamarinios/xunit.execution.dotnet.xml",
+        "xunit.extensibility.execution.2.1.0-rc1-build3168.nupkg",
+        "xunit.extensibility.execution.2.1.0-rc1-build3168.nupkg.sha512",
         "xunit.extensibility.execution.nuspec"
       ]
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-    "xunit.netcore.extensions/1.0.0-prerelease-00085": {
+    "xunit.netcore.extensions/1.0.0-prerelease-00090": {
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       "serviceable": true,
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+      "sha512": "9t2jrzI6N5ueydH5omBi95hiBOuNXpI6sS2kQJO56+bUavVpSD6/aD0C4+Nqbiql8Zvu0yx2GO+2IAd0JQcjIA==",
       "files": [
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-        "xunit.netcore.extensions.1.0.0-prerelease-00085.nupkg",
-        "xunit.netcore.extensions.1.0.0-prerelease-00085.nupkg.sha512",
+        "xunit.netcore.extensions.1.0.0-prerelease-00090.nupkg",
+        "xunit.netcore.extensions.1.0.0-prerelease-00090.nupkg.sha512",
         "xunit.netcore.extensions.nuspec"
       ]
     }
   },
   "projectFileDependencyGroups": {
     "": [
+      "Microsoft.DotNet.xunit.performance >= 1.0.0-*",
       "System.Console >= 4.0.0-beta-*",
       "System.IO.FileSystem >= 4.0.0",
       "System.Globalization >= 4.0.10",
@@ -1193,7 +1555,7 @@
       "System.Runtime.InteropServices.RuntimeInformation >= 4.0.0-beta-*",
       "System.Threading >= 4.0.10",
       "System.Threading.Tasks >= 4.0.10",
-      "xunit >= 2.1.0-beta3-*",
+      "xunit >= 2.1.0-rc1-*",
       "xunit.netcore.extensions >= 1.0.0-prerelease-*"
     ],
     "DNXCore,Version=v5.0": []
diff --git a/src/System.Runtime/tests/Performance/Perf.Boolean.cs b/src/System.Runtime/tests/Performance/Perf.Boolean.cs
new file mode 100644
index 0000000000..e90450c1cb
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.Boolean.cs
@@ -0,0 +1,36 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Xunit;
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_Boolean
+    {
+        [Benchmark]
+        public void Parse_str()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    Boolean.Parse("True"); Boolean.Parse("True"); Boolean.Parse("True");
+                    Boolean.Parse("True"); Boolean.Parse("True"); Boolean.Parse("True");
+                    Boolean.Parse("True"); Boolean.Parse("True"); Boolean.Parse("True");
+                }
+        }
+
+        [Benchmark]
+        public void ToString_()
+        {
+            Boolean boo = true;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    boo.ToString(); boo.ToString(); boo.ToString();
+                    boo.ToString(); boo.ToString(); boo.ToString();
+                    boo.ToString(); boo.ToString(); boo.ToString();
+                }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.DateTime.cs b/src/System.Runtime/tests/Performance/Perf.DateTime.cs
new file mode 100644
index 0000000000..307ec238ee
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.DateTime.cs
@@ -0,0 +1,51 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_DateTime
+    {
+        [Benchmark]
+        public void GetNow()
+        {
+            DateTime dt;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    dt = DateTime.Now; dt = DateTime.Now; dt = DateTime.Now;
+                    dt = DateTime.Now; dt = DateTime.Now; dt = DateTime.Now;
+                    dt = DateTime.Now; dt = DateTime.Now; dt = DateTime.Now;
+                }
+        }
+
+        [Benchmark]
+        public void ToString_str()
+        {
+            DateTime dt = DateTime.Now;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    dt.ToString("g"); dt.ToString("g"); dt.ToString("g");
+                    dt.ToString("g"); dt.ToString("g"); dt.ToString("g");
+                    dt.ToString("g"); dt.ToString("g"); dt.ToString("g");
+                }
+        }
+
+        [Benchmark]
+        public void op_Subtraction()
+        {
+            TimeSpan result;
+            DateTime date1 = new DateTime(1996, 6, 3, 22, 15, 0);
+            DateTime date2 = new DateTime(1996, 12, 6, 13, 2, 0);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    result = date1 - date2; result = date1 - date2; result = date1 - date2;
+                    result = date1 - date2; result = date1 - date2; result = date1 - date2;
+                    result = date1 - date2; result = date1 - date2; result = date1 - date2;
+                }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.Enum.cs b/src/System.Runtime/tests/Performance/Perf.Enum.cs
new file mode 100644
index 0000000000..eda62f6339
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.Enum.cs
@@ -0,0 +1,28 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_Enum
+    {
+        private enum testEnum
+        {
+            Red = 1,
+            Blue = 2
+        }
+
+        [Benchmark]
+        public void Parse()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    Enum.Parse(typeof(testEnum), "Red"); Enum.Parse(typeof(testEnum), "Red"); Enum.Parse(typeof(testEnum), "Red");
+                    Enum.Parse(typeof(testEnum), "Red"); Enum.Parse(typeof(testEnum), "Red"); Enum.Parse(typeof(testEnum), "Red");
+                    Enum.Parse(typeof(testEnum), "Red"); Enum.Parse(typeof(testEnum), "Red"); Enum.Parse(typeof(testEnum), "Red");
+                }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.Guid.cs b/src/System.Runtime/tests/Performance/Perf.Guid.cs
new file mode 100644
index 0000000000..ca04a78b10
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.Guid.cs
@@ -0,0 +1,37 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+using System.Text;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_Guid
+    {
+        [Benchmark]
+        public void NewGuid()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    Guid.NewGuid(); Guid.NewGuid(); Guid.NewGuid();
+                    Guid.NewGuid(); Guid.NewGuid(); Guid.NewGuid();
+                    Guid.NewGuid(); Guid.NewGuid(); Guid.NewGuid();
+                }
+        }
+
+        [Benchmark]
+        public void ctor_str()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    new Guid("a8a110d5-fc49-43c5-bf46-802db8f843ff"); new Guid("a8a110d5-fc49-43c5-bf46-802db8f843ff");
+                    new Guid("a8a110d5-fc49-43c5-bf46-802db8f843ff"); new Guid("a8a110d5-fc49-43c5-bf46-802db8f843ff");
+                    new Guid("a8a110d5-fc49-43c5-bf46-802db8f843ff"); new Guid("a8a110d5-fc49-43c5-bf46-802db8f843ff");
+                    new Guid("a8a110d5-fc49-43c5-bf46-802db8f843ff"); new Guid("a8a110d5-fc49-43c5-bf46-802db8f843ff");
+                    new Guid("a8a110d5-fc49-43c5-bf46-802db8f843ff");
+                }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.Int32.cs b/src/System.Runtime/tests/Performance/Perf.Int32.cs
new file mode 100644
index 0000000000..0a9a593206
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.Int32.cs
@@ -0,0 +1,37 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Xunit;
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_Int32
+    {
+        [Benchmark]
+        public void ToString_()
+        {
+            Int32 i32 = 32;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    i32.ToString(); i32.ToString(); i32.ToString();
+                    i32.ToString(); i32.ToString(); i32.ToString();
+                    i32.ToString(); i32.ToString(); i32.ToString();
+                }
+        }
+
+        [Benchmark]
+        public void Parse_str()
+        {
+            string builtString = "1111111";
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    Int32.Parse(builtString); Int32.Parse(builtString); Int32.Parse(builtString);
+                    Int32.Parse(builtString); Int32.Parse(builtString); Int32.Parse(builtString);
+                    Int32.Parse(builtString); Int32.Parse(builtString); Int32.Parse(builtString);
+                }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.IntPtr.cs b/src/System.Runtime/tests/Performance/Perf.IntPtr.cs
new file mode 100644
index 0000000000..256d5753ba
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.IntPtr.cs
@@ -0,0 +1,37 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_IntPtr
+    {
+        [Benchmark]
+        public void ctor_int32()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    new IntPtr(0); new IntPtr(0); new IntPtr(0);
+                    new IntPtr(0); new IntPtr(0); new IntPtr(0);
+                    new IntPtr(0); new IntPtr(0); new IntPtr(0);
+                }
+        }
+
+        [Benchmark]
+        public void op_Equality_IntPtr_IntPtr()
+        {
+            bool res;
+            IntPtr ptr1 = new IntPtr(0);
+            IntPtr ptr2 = new IntPtr(0);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    res = ptr1 == ptr2; res = ptr1 == ptr2; res = ptr1 == ptr2;
+                    res = ptr1 == ptr2; res = ptr1 == ptr2; res = ptr1 == ptr2;
+                    res = ptr1 == ptr2; res = ptr1 == ptr2; res = ptr1 == ptr2;
+                }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.Object.cs b/src/System.Runtime/tests/Performance/Perf.Object.cs
new file mode 100644
index 0000000000..bb1079beba
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.Object.cs
@@ -0,0 +1,35 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_Object
+    {
+        [Benchmark]
+        public void ctor()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    new Object(); new Object(); new Object();
+                    new Object(); new Object(); new Object();
+                    new Object(); new Object(); new Object();
+                }
+        }
+
+        [Benchmark]
+        public void GetType_()
+        {
+            Object obj = new Object();
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    obj.GetType(); obj.GetType(); obj.GetType();
+                    obj.GetType(); obj.GetType(); obj.GetType();
+                    obj.GetType(); obj.GetType(); obj.GetType();
+                }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.String.cs b/src/System.Runtime/tests/Performance/Perf.String.cs
new file mode 100644
index 0000000000..56e6fcf950
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.String.cs
@@ -0,0 +1,240 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Text;
+using System.Collections.Generic;
+using Xunit;
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_String
+    {
+        public static IEnumerable<object[]> TestStringSizes()
+        {
+            yield return new object[] { 10 };
+            yield return new object[] { 100 };
+            yield return new object[] { 1000 };
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void GetChars(int size)
+        {
+            string testString = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.ToCharArray();
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Concat_str_str(int size)
+        {
+            string testString1 = PerfUtils.CreateString(size);
+            string testString2 = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    string.Concat(testString1, testString2);
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Concat_str_str_str(int size)
+        {
+            string testString1 = PerfUtils.CreateString(size);
+            string testString2 = PerfUtils.CreateString(size);
+            string testString3 = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    string.Concat(testString1, testString2, testString3);
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Concat_str_str_str_str(int size)
+        {
+            string testString1 = PerfUtils.CreateString(size);
+            string testString2 = PerfUtils.CreateString(size);
+            string testString3 = PerfUtils.CreateString(size);
+            string testString4 = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    string.Concat(testString1, testString2, testString3, testString4);
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Contains(int size)
+        {
+            string testString = PerfUtils.CreateString(size);
+            string subString = testString.Substring(testString.Length / 2, testString.Length / 4);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.Contains(subString);
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Equals(int size)
+        {
+            string testString1 = PerfUtils.CreateString(size);
+            string testString2 = new string(testString1.ToCharArray());
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString1.Equals(testString2);
+        }
+
+        [Benchmark]
+        [InlineData(1)]
+        [InlineData(2)]
+        [InlineData(3)]
+        [InlineData(10)]
+        [InlineData(100)]
+        public void Format(int numberOfObjects)
+        {
+            // Setup the format string and the list of objects to format
+            StringBuilder formatter = new StringBuilder();
+            List<string> objects = new List<string>();
+            for (int i = 0; i < numberOfObjects; i++)
+            {
+                formatter.Append("%s, ");
+                objects.Add(PerfUtils.CreateString(10));
+            }
+            string format = formatter.ToString();
+            string[] objectArr = objects.ToArray();
+
+            // Perform the actual formatting
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    string.Format(format, objectArr);
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void GetLength(int size)
+        {
+            int result;
+            string testString = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    result = testString.Length; result = testString.Length; result = testString.Length;
+                    result = testString.Length; result = testString.Length; result = testString.Length;
+                    result = testString.Length; result = testString.Length; result = testString.Length;
+                }
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void op_Equality(int size)
+        {
+            bool result;
+            string testString1 = PerfUtils.CreateString(size);
+            string testString2 = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    result = testString1 == testString2; result = testString1 == testString2;
+                    result = testString1 == testString2; result = testString1 == testString2;
+                    result = testString1 == testString2; result = testString1 == testString2;
+                }
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Replace(int size)
+        {
+            string testString = PerfUtils.CreateString(size);
+            string existingValue = testString.Substring(testString.Length / 2, 1);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.Replace(existingValue, "1");
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Split(int size)
+        {
+            string testString = PerfUtils.CreateString(size);
+            string existingValue = testString.Substring(testString.Length / 2, 1);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.Split(existingValue);
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void StartsWith(int size)
+        {
+            string testString = PerfUtils.CreateString(size);
+            string subString = testString.Substring(0, testString.Length / 4);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.StartsWith(subString);
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Substring_int(int size)
+        {
+            int startIndex = size / 2;
+            string testString = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.Substring(startIndex);
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Substring_int_int(int size)
+        {
+            int startIndex = size / 2;
+            int length = size / 4;
+            string testString = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.Substring(startIndex, length);
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void ToLower(int size)
+        {
+            string testString = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.ToLower();
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void ToUpper(int size)
+        {
+            string testString = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.ToUpper();
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Trim_WithWhitespace(int size)
+        {
+            string testString = "   " + PerfUtils.CreateString(size) + "   ";
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.Trim();
+        }
+
+        [Benchmark]
+        [MemberData("TestStringSizes")]
+        public void Trim_NothingToDo(int size)
+        {
+            string testString = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                    testString.Trim();
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.StringBuilder.cs b/src/System.Runtime/tests/Performance/Perf.StringBuilder.cs
new file mode 100644
index 0000000000..a64a02c169
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.StringBuilder.cs
@@ -0,0 +1,42 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Text;
+using Xunit;
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_StringBuilder
+    {
+        [Benchmark]
+        public void ctor()
+        {
+            StringBuilder builder;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    builder = new StringBuilder(); builder = new StringBuilder(); builder = new StringBuilder();
+                    builder = new StringBuilder(); builder = new StringBuilder(); builder = new StringBuilder();
+                    builder = new StringBuilder(); builder = new StringBuilder(); builder = new StringBuilder();
+                }
+        }
+
+        [Benchmark]
+        [InlineData(0)]
+        [InlineData(200)]
+        public void Append(int length)
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Setup - Create a string of the specified length
+                string builtString = PerfUtils.CreateString(length);
+                StringBuilder empty = new StringBuilder();
+
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                    empty.Append(builtString); // Appends a string of length "length" to an empty StringBuilder object
+            }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.TimeSpan.cs b/src/System.Runtime/tests/Performance/Perf.TimeSpan.cs
new file mode 100644
index 0000000000..3dbf8c67ef
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.TimeSpan.cs
@@ -0,0 +1,34 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_TimeSpan
+    {
+        [Benchmark]
+        public void ctor_int_int_int()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    new TimeSpan(7, 8, 10); new TimeSpan(7, 8, 10); new TimeSpan(7, 8, 10);
+                    new TimeSpan(7, 8, 10); new TimeSpan(7, 8, 10); new TimeSpan(7, 8, 10);
+                    new TimeSpan(7, 8, 10); new TimeSpan(7, 8, 10); new TimeSpan(7, 8, 10);
+                }
+        }
+
+        [Benchmark]
+        public void FromSeconds()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    TimeSpan.FromSeconds(50); TimeSpan.FromSeconds(50); TimeSpan.FromSeconds(50);
+                    TimeSpan.FromSeconds(50); TimeSpan.FromSeconds(50); TimeSpan.FromSeconds(50);
+                    TimeSpan.FromSeconds(50); TimeSpan.FromSeconds(50); TimeSpan.FromSeconds(50);
+                }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.Type.cs b/src/System.Runtime/tests/Performance/Perf.Type.cs
new file mode 100644
index 0000000000..cd178d4fbb
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.Type.cs
@@ -0,0 +1,38 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_Type
+    {
+        [Benchmark]
+        public void GetTypeFromHandle()
+        {
+            RuntimeTypeHandle type1 = typeof(int).TypeHandle;
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    Type.GetTypeFromHandle(type1); Type.GetTypeFromHandle(type1); Type.GetTypeFromHandle(type1);
+                    Type.GetTypeFromHandle(type1); Type.GetTypeFromHandle(type1); Type.GetTypeFromHandle(type1);
+                    Type.GetTypeFromHandle(type1); Type.GetTypeFromHandle(type1); Type.GetTypeFromHandle(type1);
+                }
+        }
+
+        [Benchmark]
+        public void op_Equality()
+        {
+            bool result;
+            Type type1 = typeof(int);
+            Type type2 = typeof(string);
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    result = type1 == type2; result = type1 == type2; result = type1 == type2;
+                    result = type1 == type2; result = type1 == type2; result = type1 == type2;
+                    result = type1 == type2; result = type1 == type2; result = type1 == type2;
+                }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/Performance/Perf.UInt32.cs b/src/System.Runtime/tests/Performance/Perf.UInt32.cs
new file mode 100644
index 0000000000..d6e8428c87
--- /dev/null
+++ b/src/System.Runtime/tests/Performance/Perf.UInt32.cs
@@ -0,0 +1,23 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_UInt32
+    {
+        [Benchmark]
+        public void ToString_()
+        {
+            UInt32 i = new UInt32();
+            foreach (var iteration in Benchmark.Iterations)
+                using (iteration.StartMeasurement())
+                {
+                    i.ToString(); i.ToString(); i.ToString();
+                    i.ToString(); i.ToString(); i.ToString();
+                    i.ToString(); i.ToString(); i.ToString();
+                }
+        }
+    }
+}
diff --git a/src/System.Runtime/tests/System.Runtime.Tests.csproj b/src/System.Runtime/tests/System.Runtime.Tests.csproj
index fc466c73fa..e9fc539b1b 100644
--- a/src/System.Runtime/tests/System.Runtime.Tests.csproj
+++ b/src/System.Runtime/tests/System.Runtime.Tests.csproj
@@ -12,6 +12,11 @@
     <RestorePackages>true</RestorePackages>
     <NoWarn>1718</NoWarn>
   </PropertyGroup>
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
   <!-- Default configurations to help VS understand the configurations -->
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
   </PropertyGroup>
@@ -89,6 +94,24 @@
     <Compile Include="System\Version.cs" />
     <Compile Include="System\WeakReference.cs" />
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.Boolean.cs" />
+    <Compile Include="Performance\Perf.Enum.cs" />
+    <Compile Include="Performance\Perf.Guid.cs" />
+    <Compile Include="Performance\Perf.Object.cs" />
+    <Compile Include="Performance\Perf.String.cs" />
+    <Compile Include="Performance\Perf.TimeSpan.cs" />
+    <Compile Include="Performance\Perf.Type.cs" />
+    <Compile Include="Performance\Perf.UInt32.cs" />
+    <Compile Include="Performance\Perf.DateTime.cs" />
+    <Compile Include="Performance\Perf.Int32.cs" />
+    <Compile Include="Performance\Perf.IntPtr.cs" />
+    <Compile Include="Performance\Perf.StringBuilder.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <ItemGroup>
     <None Include="project.json" />
   </ItemGroup>
diff --git a/src/System.Runtime/tests/project.json b/src/System.Runtime/tests/project.json
index bc079ff8c3..ae615392f0 100644
--- a/src/System.Runtime/tests/project.json
+++ b/src/System.Runtime/tests/project.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "Microsoft.DotNet.xunit.performance": "1.0.0-*",
     "System.Console": "4.0.0-beta-*",
     "System.Globalization": "4.0.10",
     "System.Reflection": "4.0.10",
@@ -9,7 +10,7 @@
     "System.Runtime.InteropServices.RuntimeInformation": "4.0.0-beta-*",
     "System.Threading": "4.0.10",
     "System.Threading.Tasks": "4.0.10",
-    "xunit": "2.1.0-beta3-*",
+    "xunit": "2.1.0-rc1-*",
     "xunit.netcore.extensions": "1.0.0-prerelease-*"
   },
   "frameworks": {
diff --git a/src/System.Runtime/tests/project.lock.json b/src/System.Runtime/tests/project.lock.json
index a2fee34c07..99596a5aa1 100644
--- a/src/System.Runtime/tests/project.lock.json
+++ b/src/System.Runtime/tests/project.lock.json
@@ -3,6 +3,36 @@
   "version": 1,
   "targets": {
     "DNXCore,Version=v5.0": {
+      "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.Diagnostics.Debug": "4.0.10",
+          "System.Diagnostics.Tracing": "4.0.20",
+          "System.Globalization": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem": "4.0.0",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.10",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Text.Encoding": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Tasks": "4.0.10",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "2.1.0-rc1-build3168",
+          "xunit.extensibility.execution": "2.1.0-rc1-build3168"
+        },
+        "compile": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        }
+      },
       "System.Collections/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -15,7 +45,7 @@
           "lib/DNXCore50/System.Collections.dll": {}
         }
       },
-      "System.Console/4.0.0-beta-23311": {
+      "System.Console/4.0.0-beta-23316": {
         "type": "package",
         "dependencies": {
           "System.IO": "4.0.0",
@@ -37,6 +67,18 @@
           "lib/DNXCore50/System.Diagnostics.Debug.dll": {}
         }
       },
+      "System.Diagnostics.Tracing/4.0.20": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Diagnostics.Tracing.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Diagnostics.Tracing.dll": {}
+        }
+      },
       "System.Globalization/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -63,6 +105,42 @@
           "lib/DNXCore50/System.IO.dll": {}
         }
       },
+      "System.IO.FileSystem/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Resources.ResourceManager": "4.0.0",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Runtime.Handles": "4.0.0",
+          "System.Runtime.InteropServices": "4.0.20",
+          "System.Text.Encoding": "4.0.10",
+          "System.Text.Encoding.Extensions": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Overlapped": "4.0.0",
+          "System.Threading.Tasks": "4.0.10"
+        },
+        "compile": {
+          "ref/dotnet/System.IO.FileSystem.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.IO.FileSystem.dll": {}
+        }
+      },
+      "System.IO.FileSystem.Primitives/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.20"
+        },
+        "compile": {
+          "ref/dotnet/System.IO.FileSystem.Primitives.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/System.IO.FileSystem.Primitives.dll": {}
+        }
+      },
       "System.Linq/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -79,6 +157,25 @@
           "lib/dotnet/System.Linq.dll": {}
         }
       },
+      "System.Linq.Expressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Linq.Expressions.dll": {}
+        }
+      },
+      "System.ObjectModel/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.ObjectModel.dll": {}
+        }
+      },
       "System.Private.Uri/4.0.0": {
         "type": "package",
         "compile": {
@@ -102,6 +199,19 @@
           "lib/DNXCore50/System.Reflection.dll": {}
         }
       },
+      "System.Reflection.Extensions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Reflection.Extensions.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Reflection.Extensions.dll": {}
+        }
+      },
       "System.Reflection.Primitives/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -179,7 +289,7 @@
           "lib/DNXCore50/System.Runtime.InteropServices.dll": {}
         }
       },
-      "System.Runtime.InteropServices.RuntimeInformation/4.0.0-beta-23311": {
+      "System.Runtime.InteropServices.RuntimeInformation/4.0.0-beta-23316": {
         "type": "package",
         "dependencies": {
           "System.Resources.ResourceManager": "4.0.0",
@@ -204,6 +314,28 @@
           "lib/DNXCore50/System.Text.Encoding.dll": {}
         }
       },
+      "System.Text.Encoding.Extensions/4.0.10": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0",
+          "System.Text.Encoding": "4.0.10"
+        },
+        "compile": {
+          "ref/dotnet/System.Text.Encoding.Extensions.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Text.Encoding.Extensions.dll": {}
+        }
+      },
+      "System.Text.RegularExpressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Text.RegularExpressions.dll": {}
+        }
+      },
       "System.Threading/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -217,6 +349,19 @@
           "lib/DNXCore50/System.Threading.dll": {}
         }
       },
+      "System.Threading.Overlapped/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Handles": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Threading.Overlapped.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Threading.Overlapped.dll": {}
+        }
+      },
       "System.Threading.Tasks/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -229,11 +374,11 @@
           "lib/DNXCore50/System.Threading.Tasks.dll": {}
         }
       },
-      "xunit/2.1.0-beta3-build3029": {
+      "xunit/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.assert": "[2.1.0-beta3-build3029]",
-          "xunit.core": "[2.1.0-beta3-build3029]"
+          "xunit.assert": "[2.1.0-rc1-build3168]",
+          "xunit.core": "[2.1.0-rc1-build3168]"
         }
       },
       "xunit.abstractions/2.0.0": {
@@ -245,49 +390,86 @@
           "lib/portable-net45+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.abstractions.dll": {}
         }
       },
-      "xunit.assert/2.1.0-beta3-build3029": {
+      "xunit.assert/2.1.0-rc1-build3168": {
         "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.ObjectModel": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Text.RegularExpressions": "4.0.0",
+          "System.Threading.Tasks": "4.0.0"
+        },
         "compile": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         },
         "runtime": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         }
       },
-      "xunit.core/2.1.0-beta3-build3029": {
+      "xunit.core/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.extensibility.core": "[2.1.0-beta3-build3029]",
-          "xunit.extensibility.execution": "[2.1.0-beta3-build3029]"
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Threading.Tasks": "4.0.0",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "[2.1.0-rc1-build3168]",
+          "xunit.extensibility.execution": "[2.1.0-rc1-build3168]"
         }
       },
-      "xunit.extensibility.core/2.1.0-beta3-build3029": {
+      "xunit.extensibility.core/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
           "xunit.abstractions": "[2.0.0]"
         },
         "compile": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.core.dll": {}
+          "lib/dotnet/xunit.core.dll": {}
         },
         "runtime": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.core.dll": {},
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.runner.tdnet.dll": {},
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.runner.utility.desktop.dll": {}
+          "lib/dotnet/xunit.core.dll": {},
+          "lib/dotnet/xunit.runner.tdnet.dll": {},
+          "lib/dotnet/xunit.runner.utility.desktop.dll": {}
         }
       },
-      "xunit.extensibility.execution/2.1.0-beta3-build3029": {
+      "xunit.extensibility.execution/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.extensibility.core": "[2.1.0-beta3-build3029]"
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.IO": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Linq.Expressions": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Text.Encoding": "4.0.0",
+          "System.Threading": "4.0.0",
+          "System.Threading.Tasks": "4.0.0",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "[2.1.0-rc1-build3168]"
         },
         "compile": {
-          "lib/dnxcore50/xunit.execution.dnx.dll": {}
+          "lib/dotnet/xunit.execution.dotnet.dll": {}
         },
         "runtime": {
-          "lib/dnxcore50/xunit.execution.dnx.dll": {}
+          "lib/dotnet/xunit.execution.dotnet.dll": {}
         }
       },
-      "xunit.netcore.extensions/1.0.0-prerelease-00085": {
+      "xunit.netcore.extensions/1.0.0-prerelease-00090": {
         "type": "package",
         "dependencies": {
           "System.Diagnostics.Debug": "4.0.10",
@@ -315,6 +497,25 @@
     }
   },
   "libraries": {
+    "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+      "type": "package",
+      "sha512": "NCrgkMUcuMy3T5PY9kcBFpRyN/HrUyHsSxvdyq426iTZj2pG+6odaztW5BrQov3gPEXM5cPx4+64djl4sC8/nw==",
+      "files": [
+        "lib/dotnet/xunit.performance.core.dll",
+        "lib/dotnet/xunit.performance.core.pdb",
+        "lib/dotnet/xunit.performance.core.XML",
+        "lib/dotnet/xunit.performance.execution.dotnet.dll",
+        "lib/dotnet/xunit.performance.execution.dotnet.pdb",
+        "lib/net46/xunit.performance.core.dll",
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-        "xunit.netcore.extensions.1.0.0-prerelease-00085.nupkg.sha512",
+        "xunit.netcore.extensions.1.0.0-prerelease-00090.nupkg",
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     "": [
+      "Microsoft.DotNet.xunit.performance >= 1.0.0-*",
       "System.Console >= 4.0.0-beta-*",
       "System.Globalization >= 4.0.10",
       "System.Reflection >= 4.0.10",
@@ -1008,7 +1555,7 @@
       "System.Runtime.InteropServices.RuntimeInformation >= 4.0.0-beta-*",
       "System.Threading >= 4.0.10",
       "System.Threading.Tasks >= 4.0.10",
-      "xunit >= 2.1.0-beta3-*",
+      "xunit >= 2.1.0-rc1-*",
       "xunit.netcore.extensions >= 1.0.0-prerelease-*"
     ],
     "DNXCore,Version=v5.0": []
diff --git a/src/System.Text.Encoding/tests/Performance/Perf.Encoding.cs b/src/System.Text.Encoding/tests/Performance/Perf.Encoding.cs
new file mode 100644
index 0000000000..a9bf4ee9ab
--- /dev/null
+++ b/src/System.Text.Encoding/tests/Performance/Perf.Encoding.cs
@@ -0,0 +1,30 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Text;
+using Xunit;
+using Microsoft.Xunit.Performance;
+
+namespace System.Runtime.Tests
+{
+    public class Perf_Encoding
+    {
+        [Benchmark]
+        [InlineData(10000)]
+        [InlineData(1000000)]
+        public void GetBytes_str(int size)
+        {
+            Encoding enc = Encoding.UTF8;
+            string toEncode = PerfUtils.CreateString(size);
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    enc.GetBytes(toEncode); enc.GetBytes(toEncode); enc.GetBytes(toEncode);
+                    enc.GetBytes(toEncode); enc.GetBytes(toEncode); enc.GetBytes(toEncode);
+                    enc.GetBytes(toEncode); enc.GetBytes(toEncode); enc.GetBytes(toEncode);
+                }
+            }
+        }
+    }
+}
diff --git a/src/System.Text.Encoding/tests/System.Text.Encoding.Tests.csproj b/src/System.Text.Encoding/tests/System.Text.Encoding.Tests.csproj
index e150ef7fe2..487d320aea 100644
--- a/src/System.Text.Encoding/tests/System.Text.Encoding.Tests.csproj
+++ b/src/System.Text.Encoding/tests/System.Text.Encoding.Tests.csproj
@@ -9,7 +9,12 @@
     <AssemblyName>System.Text.Encoding.Tests</AssemblyName>
     <RootNamespace>System.Text.Encoding.Tests</RootNamespace>
   </PropertyGroup>
-   <!-- Default configurations to help VS understand the configurations -->
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
+  <!-- Default configurations to help VS understand the configurations -->
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
@@ -117,8 +122,15 @@
     <Compile Include="UTF8Encoding\UTF8EncodingGetString.cs" />
     <Compile Include="$(CommonTestPath)\System\RandomDataGenerator.cs" />
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.Encoding.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <ItemGroup>
     <None Include="project.json" />
   </ItemGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
+</Project>
\ No newline at end of file
diff --git a/src/System.Text.Encoding/tests/project.json b/src/System.Text.Encoding/tests/project.json
index 6f9ba3a156..1103736ee7 100644
--- a/src/System.Text.Encoding/tests/project.json
+++ b/src/System.Text.Encoding/tests/project.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "Microsoft.DotNet.xunit.performance": "1.0.0-*",
     "System.Globalization": "4.0.10",
     "System.Collections": "4.0.10",
     "System.Threading.Tasks": "4.0.10",
@@ -7,7 +8,7 @@
     "System.Runtime.Extensions": "4.0.10",
     "System.Text.Encoding": "4.0.10",
     "System.Text.Encoding.Extensions": "4.0.10",
-    "xunit": "2.1.0-beta3-*",
+    "xunit": "2.1.0-rc1-*",
     "xunit.netcore.extensions": "1.0.0-prerelease-*"
   },
   "frameworks": {
diff --git a/src/System.Text.Encoding/tests/project.lock.json b/src/System.Text.Encoding/tests/project.lock.json
index bcc250e939..ae8632c398 100644
--- a/src/System.Text.Encoding/tests/project.lock.json
+++ b/src/System.Text.Encoding/tests/project.lock.json
@@ -3,6 +3,36 @@
   "version": 1,
   "targets": {
     "DNXCore,Version=v5.0": {
+      "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.Diagnostics.Debug": "4.0.10",
+          "System.Diagnostics.Tracing": "4.0.20",
+          "System.Globalization": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem": "4.0.0",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.10",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Text.Encoding": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Tasks": "4.0.10",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "2.1.0-rc1-build3168",
+          "xunit.extensibility.execution": "2.1.0-rc1-build3168"
+        },
+        "compile": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        }
+      },
       "System.Collections/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -27,6 +57,18 @@
           "lib/DNXCore50/System.Diagnostics.Debug.dll": {}
         }
       },
+      "System.Diagnostics.Tracing/4.0.20": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Diagnostics.Tracing.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Diagnostics.Tracing.dll": {}
+        }
+      },
       "System.Globalization/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -53,6 +95,42 @@
           "lib/DNXCore50/System.IO.dll": {}
         }
       },
+      "System.IO.FileSystem/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Resources.ResourceManager": "4.0.0",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Runtime.Handles": "4.0.0",
+          "System.Runtime.InteropServices": "4.0.20",
+          "System.Text.Encoding": "4.0.10",
+          "System.Text.Encoding.Extensions": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Overlapped": "4.0.0",
+          "System.Threading.Tasks": "4.0.10"
+        },
+        "compile": {
+          "ref/dotnet/System.IO.FileSystem.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.IO.FileSystem.dll": {}
+        }
+      },
+      "System.IO.FileSystem.Primitives/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.20"
+        },
+        "compile": {
+          "ref/dotnet/System.IO.FileSystem.Primitives.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/System.IO.FileSystem.Primitives.dll": {}
+        }
+      },
       "System.Linq/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -69,6 +147,25 @@
           "lib/dotnet/System.Linq.dll": {}
         }
       },
+      "System.Linq.Expressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Linq.Expressions.dll": {}
+        }
+      },
+      "System.ObjectModel/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.ObjectModel.dll": {}
+        }
+      },
       "System.Private.Uri/4.0.0": {
         "type": "package",
         "compile": {
@@ -92,6 +189,19 @@
           "lib/DNXCore50/System.Reflection.dll": {}
         }
       },
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+        "ref/dotnet/fr/System.Threading.Overlapped.xml",
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+        "ref/dotnet/ja/System.Threading.Overlapped.xml",
+        "ref/dotnet/ko/System.Threading.Overlapped.xml",
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@@ -892,12 +1382,12 @@
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+      "Microsoft.DotNet.xunit.performance >= 1.0.0-*",
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       "System.Collections >= 4.0.10",
       "System.Threading.Tasks >= 4.0.10",
@@ -1020,7 +1521,7 @@
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       "System.Text.Encoding >= 4.0.10",
       "System.Text.Encoding.Extensions >= 4.0.10",
-      "xunit >= 2.1.0-beta3-*",
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diff --git a/src/System.Threading/tests/Performance/Perf.EventWaitHandle.cs b/src/System.Threading/tests/Performance/Perf.EventWaitHandle.cs
new file mode 100644
index 0000000000..f4d626c628
--- /dev/null
+++ b/src/System.Threading/tests/Performance/Perf.EventWaitHandle.cs
@@ -0,0 +1,27 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.IO;
+using Microsoft.Xunit.Performance;
+
+namespace System.Threading.Tests
+{
+    public class Perf_EventWaitHandle
+    {
+        [Benchmark]
+        public void Set_Reset()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (EventWaitHandle are = new EventWaitHandle(false, EventResetMode.AutoReset))
+                using (iteration.StartMeasurement())
+                {
+                    are.Set(); are.Reset(); are.Set(); are.Reset();
+                    are.Set(); are.Reset(); are.Set(); are.Reset();
+                    are.Set(); are.Reset(); are.Set(); are.Reset();
+                    are.Set(); are.Reset(); are.Set(); are.Reset();
+                }
+            }
+        }
+    }
+}
diff --git a/src/System.Threading/tests/System.Threading.Tests.csproj b/src/System.Threading/tests/System.Threading.Tests.csproj
index 738f7c092c..f7e4bb6092 100644
--- a/src/System.Threading/tests/System.Threading.Tests.csproj
+++ b/src/System.Threading/tests/System.Threading.Tests.csproj
@@ -8,6 +8,11 @@
     <AssemblyName>System.Threading.Tests</AssemblyName>
     <ProjectGuid>{33F5A50E-B823-4FDD-8571-365C909ACEAE}</ProjectGuid>
   </PropertyGroup>
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
   <!-- Default configurations to help VS understand the configurations -->
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' " />
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' " />
@@ -35,6 +40,13 @@
       <Link>Common\System\Diagnostics\Tracing\TestEventListener.cs</Link>
     </Compile>
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.EventWaitHandle.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <ItemGroup>
     <None Include="project.json" />
   </ItemGroup>
diff --git a/src/System.Threading/tests/project.json b/src/System.Threading/tests/project.json
index b37fb5e083..29e7b6a06a 100644
--- a/src/System.Threading/tests/project.json
+++ b/src/System.Threading/tests/project.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "Microsoft.DotNet.xunit.performance": "1.0.0-*",
     "System.Collections": "4.0.10",
     "System.Console": "4.0.0-beta-*",
     "System.Diagnostics.Debug": "4.0.10",
@@ -11,7 +12,7 @@
     "System.Runtime.InteropServices": "4.0.20",
     "System.Threading": "4.0.10",
     "System.Threading.Tasks": "4.0.10",
-    "xunit": "2.1.0-beta3-*",
+    "xunit": "2.1.0-rc1-*",
     "xunit.netcore.extensions": "1.0.0-prerelease-*"
   },
   "frameworks": {
diff --git a/src/System.Threading/tests/project.lock.json b/src/System.Threading/tests/project.lock.json
index 1d74eb586c..9a1dcd0866 100644
--- a/src/System.Threading/tests/project.lock.json
+++ b/src/System.Threading/tests/project.lock.json
@@ -3,6 +3,36 @@
   "version": 1,
   "targets": {
     "DNXCore,Version=v5.0": {
+      "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.Diagnostics.Debug": "4.0.10",
+          "System.Diagnostics.Tracing": "4.0.20",
+          "System.Globalization": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem": "4.0.0",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.10",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Text.Encoding": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Tasks": "4.0.10",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "2.1.0-rc1-build3168",
+          "xunit.extensibility.execution": "2.1.0-rc1-build3168"
+        },
+        "compile": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        }
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+        "lib/netcore50/System.Threading.Overlapped.dll",
+        "ref/dotnet/de/System.Threading.Overlapped.xml",
+        "ref/dotnet/es/System.Threading.Overlapped.xml",
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+        "ref/dotnet/it/System.Threading.Overlapped.xml",
+        "ref/dotnet/ja/System.Threading.Overlapped.xml",
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diff --git a/src/System.Xml.XmlDocument/tests/Performance/Perf.XmlDocument.cs b/src/System.Xml.XmlDocument/tests/Performance/Perf.XmlDocument.cs
new file mode 100644
index 0000000000..0978ac83ec
--- /dev/null
+++ b/src/System.Xml.XmlDocument/tests/Performance/Perf.XmlDocument.cs
@@ -0,0 +1,60 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Xml;
+using Microsoft.Xunit.Performance;
+
+namespace XmlDocumentTests.XmlDocumentTests
+{
+    public class Perf_XmlDocument
+    {
+        [Benchmark]
+        public void Create()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                using (iteration.StartMeasurement())
+                {
+                    new XmlDocument(); new XmlDocument(); new XmlDocument();
+                    new XmlDocument(); new XmlDocument(); new XmlDocument();
+                    new XmlDocument(); new XmlDocument(); new XmlDocument();
+                }
+            }
+        }
+
+        [Benchmark]
+        public void LoadXml()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Setup
+                var doc = new XmlDocument();
+
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                    doc.LoadXml("<elem1 child1='' child2='duu' child3='e1;e2;' child4='a1' child5='goody'> text node two e1; text node three </elem1>");
+            }
+        }
+
+        [Benchmark]
+        public void GetDocumentElement()
+        {
+            XmlNode element;
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Setup
+                var doc = new XmlDocument();
+                doc.LoadXml("<elem1 child1='' child2='duu' child3='e1;e2;' child4='a1' child5='goody'> text node two e1; text node three </elem1>");
+
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                {
+                    element = doc.DocumentElement; element = doc.DocumentElement; element = doc.DocumentElement;
+                    element = doc.DocumentElement; element = doc.DocumentElement; element = doc.DocumentElement;
+                    element = doc.DocumentElement; element = doc.DocumentElement; element = doc.DocumentElement;
+                }
+            }
+        }
+    }
+}
diff --git a/src/System.Xml.XmlDocument/tests/Performance/Perf.XmlNode.cs b/src/System.Xml.XmlDocument/tests/Performance/Perf.XmlNode.cs
new file mode 100644
index 0000000000..980f91db95
--- /dev/null
+++ b/src/System.Xml.XmlDocument/tests/Performance/Perf.XmlNode.cs
@@ -0,0 +1,54 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Xml;
+using Microsoft.Xunit.Performance;
+
+namespace XmlDocumentTests.XmlNodeTests
+{
+    public class Perf_XmlNode
+    {
+        [Benchmark]
+        public void GetAttributes()
+        {
+            XmlAttributeCollection attr;
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Setup
+                XmlDocument doc = new XmlDocument();
+                doc.LoadXml("<a attr1='test' attr2='test2' />");
+                XmlNode node = doc.DocumentElement;
+
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                {
+                    attr = node.Attributes; attr = node.Attributes; attr = node.Attributes;
+                    attr = node.Attributes; attr = node.Attributes; attr = node.Attributes;
+                    attr = node.Attributes; attr = node.Attributes; attr = node.Attributes;
+                }
+            }
+        }
+
+        [Benchmark]
+        public void GetValue()
+        {
+            string value;
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Setup
+                var doc = new XmlDocument();
+                doc.LoadXml("<a attr1='test' attr2='test2' />");
+                XmlNode node = doc.DocumentElement;
+
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                {
+                    value = node.Value; value = node.Value; value = node.Value;
+                    value = node.Value; value = node.Value; value = node.Value;
+                    value = node.Value; value = node.Value; value = node.Value;
+                }
+            }
+        }
+    }
+}
diff --git a/src/System.Xml.XmlDocument/tests/Performance/Perf.XmlNodeList.cs b/src/System.Xml.XmlDocument/tests/Performance/Perf.XmlNodeList.cs
new file mode 100644
index 0000000000..224cdba598
--- /dev/null
+++ b/src/System.Xml.XmlDocument/tests/Performance/Perf.XmlNodeList.cs
@@ -0,0 +1,49 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Xml;
+using Microsoft.Xunit.Performance;
+
+namespace XmlDocumentTests.XmlNodeListTests
+{
+    public class Perf_XmlNodeList
+    {
+        [Benchmark]
+        public void Enumerator()
+        {
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Setup
+                var doc = new XmlDocument();
+                doc.LoadXml("<a><sub1/><sub1/><sub2/><sub1/><sub2/><sub1/><sub2/><sub1/><sub2/><sub1/><sub2/><sub2/></a>");
+                XmlNodeList list = doc.DocumentElement.ChildNodes;
+
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                    foreach (var element in list) { }
+            }
+        }
+
+        [Benchmark]
+        public void GetCount()
+        {
+            int count;
+            foreach (var iteration in Benchmark.Iterations)
+            {
+                // Setup
+                var doc = new XmlDocument();
+                doc.LoadXml("<a><sub1/><sub2/></a>");
+                XmlNodeList list = doc.DocumentElement.ChildNodes;
+
+                // Actual perf testing
+                using (iteration.StartMeasurement())
+                {
+                    count = list.Count; count = list.Count; count = list.Count;
+                    count = list.Count; count = list.Count; count = list.Count;
+                    count = list.Count; count = list.Count; count = list.Count;
+                }
+            }
+        }
+    }
+}
diff --git a/src/System.Xml.XmlDocument/tests/System.Xml.XmlDocument.Tests.csproj b/src/System.Xml.XmlDocument/tests/System.Xml.XmlDocument.Tests.csproj
index 21979af33a..d2084731e8 100644
--- a/src/System.Xml.XmlDocument/tests/System.Xml.XmlDocument.Tests.csproj
+++ b/src/System.Xml.XmlDocument/tests/System.Xml.XmlDocument.Tests.csproj
@@ -10,6 +10,11 @@
     <AssemblyName>System.Xml.XmlDocument.Tests</AssemblyName>
     <RootNamespace>System.Xml.XmlDocument.UnitTests</RootNamespace>
   </PropertyGroup>
+  <!-- Performance tests require v5.0 portable tools -->
+  <PropertyGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
   <!-- Default configurations to help VS understand the configurations -->
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
   </PropertyGroup>
@@ -100,6 +105,15 @@
     <Compile Include="XmlProcessingInstructionTests\TargetTests.cs" />
     <Compile Include="XmlTextTests\SplitTextTests.cs" />
   </ItemGroup>
+  <!-- Performance Tests -->
+  <ItemGroup Condition="'$(RunPerfTestsForProject)' == 'true'">
+    <Compile Include="Performance\Perf.XmlDocument.cs" />
+    <Compile Include="Performance\Perf.XmlNode.cs" />
+    <Compile Include="Performance\Perf.XmlNodeList.cs" />
+    <Compile Include="$(CommonTestPath)\Performance\PerfUtils.cs">
+      <Link>Common\Performance\PerfUtils.cs</Link>
+    </Compile>
+  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\src\System.Xml.XmlDocument.csproj">
       <Project>{16EE5522-F387-4C9E-9EF2-B5134B043F37}</Project>
diff --git a/src/System.Xml.XmlDocument/tests/project.json b/src/System.Xml.XmlDocument/tests/project.json
index 86a56e693d..431d168329 100644
--- a/src/System.Xml.XmlDocument/tests/project.json
+++ b/src/System.Xml.XmlDocument/tests/project.json
@@ -1,9 +1,10 @@
 {
   "dependencies": {
+    "Microsoft.DotNet.xunit.performance": "1.0.0-*",
     "System.Runtime": "4.0.20",
     "System.Threading.Tasks": "4.0.10",
     "System.Xml.ReaderWriter": "4.0.10",
-    "xunit": "2.1.0-beta3-*",
+    "xunit": "2.1.0-rc1-*",
     "xunit.netcore.extensions": "1.0.0-prerelease-*"
   },
   "frameworks": {
diff --git a/src/System.Xml.XmlDocument/tests/project.lock.json b/src/System.Xml.XmlDocument/tests/project.lock.json
index afdf19f6b9..238ccaf569 100644
--- a/src/System.Xml.XmlDocument/tests/project.lock.json
+++ b/src/System.Xml.XmlDocument/tests/project.lock.json
@@ -3,6 +3,36 @@
   "version": 1,
   "targets": {
     "DNXCore,Version=v5.0": {
+      "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+        "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.10",
+          "System.Diagnostics.Debug": "4.0.10",
+          "System.Diagnostics.Tracing": "4.0.20",
+          "System.Globalization": "4.0.10",
+          "System.IO": "4.0.10",
+          "System.IO.FileSystem": "4.0.0",
+          "System.IO.FileSystem.Primitives": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.10",
+          "System.Runtime": "4.0.20",
+          "System.Runtime.Extensions": "4.0.10",
+          "System.Text.Encoding": "4.0.10",
+          "System.Threading": "4.0.10",
+          "System.Threading.Tasks": "4.0.10",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "2.1.0-rc1-build3168",
+          "xunit.extensibility.execution": "2.1.0-rc1-build3168"
+        },
+        "compile": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        },
+        "runtime": {
+          "lib/dotnet/xunit.performance.core.dll": {},
+          "lib/dotnet/xunit.performance.execution.dotnet.dll": {}
+        }
+      },
       "System.Collections/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -27,6 +57,18 @@
           "lib/DNXCore50/System.Diagnostics.Debug.dll": {}
         }
       },
+      "System.Diagnostics.Tracing/4.0.20": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Diagnostics.Tracing.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Diagnostics.Tracing.dll": {}
+        }
+      },
       "System.Globalization/4.0.10": {
         "type": "package",
         "dependencies": {
@@ -105,6 +147,25 @@
           "lib/dotnet/System.Linq.dll": {}
         }
       },
+      "System.Linq.Expressions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Linq.Expressions.dll": {}
+        }
+      },
+      "System.ObjectModel/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.ObjectModel.dll": {}
+        }
+      },
       "System.Private.Uri/4.0.0": {
         "type": "package",
         "compile": {
@@ -128,6 +189,19 @@
           "lib/DNXCore50/System.Reflection.dll": {}
         }
       },
+      "System.Reflection.Extensions/4.0.0": {
+        "type": "package",
+        "dependencies": {
+          "System.Reflection": "4.0.0",
+          "System.Runtime": "4.0.0"
+        },
+        "compile": {
+          "ref/dotnet/System.Reflection.Extensions.dll": {}
+        },
+        "runtime": {
+          "lib/DNXCore50/System.Reflection.Extensions.dll": {}
+        }
+      },
       "System.Reflection.Primitives/4.0.0": {
         "type": "package",
         "dependencies": {
@@ -323,11 +397,11 @@
           "lib/dotnet/System.Xml.ReaderWriter.dll": {}
         }
       },
-      "xunit/2.1.0-beta3-build3029": {
+      "xunit/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.assert": "[2.1.0-beta3-build3029]",
-          "xunit.core": "[2.1.0-beta3-build3029]"
+          "xunit.assert": "[2.1.0-rc1-build3168]",
+          "xunit.core": "[2.1.0-rc1-build3168]"
         }
       },
       "xunit.abstractions/2.0.0": {
@@ -339,49 +413,86 @@
           "lib/portable-net45+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.abstractions.dll": {}
         }
       },
-      "xunit.assert/2.1.0-beta3-build3029": {
+      "xunit.assert/2.1.0-rc1-build3168": {
         "type": "package",
+        "dependencies": {
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.ObjectModel": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Text.RegularExpressions": "4.0.0",
+          "System.Threading.Tasks": "4.0.0"
+        },
         "compile": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         },
         "runtime": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.assert.dll": {}
+          "lib/dotnet/xunit.assert.dll": {}
         }
       },
-      "xunit.core/2.1.0-beta3-build3029": {
+      "xunit.core/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.extensibility.core": "[2.1.0-beta3-build3029]",
-          "xunit.extensibility.execution": "[2.1.0-beta3-build3029]"
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Threading.Tasks": "4.0.0",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "[2.1.0-rc1-build3168]",
+          "xunit.extensibility.execution": "[2.1.0-rc1-build3168]"
         }
       },
-      "xunit.extensibility.core/2.1.0-beta3-build3029": {
+      "xunit.extensibility.core/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
           "xunit.abstractions": "[2.0.0]"
         },
         "compile": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.core.dll": {}
+          "lib/dotnet/xunit.core.dll": {}
         },
         "runtime": {
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.core.dll": {},
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.runner.tdnet.dll": {},
-          "lib/portable-net45+dnxcore50+win+wpa81+wp80+monotouch+monoandroid+Xamarin.iOS/xunit.runner.utility.desktop.dll": {}
+          "lib/dotnet/xunit.core.dll": {},
+          "lib/dotnet/xunit.runner.tdnet.dll": {},
+          "lib/dotnet/xunit.runner.utility.desktop.dll": {}
         }
       },
-      "xunit.extensibility.execution/2.1.0-beta3-build3029": {
+      "xunit.extensibility.execution/2.1.0-rc1-build3168": {
         "type": "package",
         "dependencies": {
-          "xunit.extensibility.core": "[2.1.0-beta3-build3029]"
+          "System.Collections": "4.0.0",
+          "System.Diagnostics.Debug": "4.0.0",
+          "System.Globalization": "4.0.0",
+          "System.IO": "4.0.0",
+          "System.Linq": "4.0.0",
+          "System.Linq.Expressions": "4.0.0",
+          "System.Reflection": "4.0.0",
+          "System.Reflection.Extensions": "4.0.0",
+          "System.Runtime": "4.0.0",
+          "System.Runtime.Extensions": "4.0.0",
+          "System.Text.Encoding": "4.0.0",
+          "System.Threading": "4.0.0",
+          "System.Threading.Tasks": "4.0.0",
+          "xunit.abstractions": "2.0.0",
+          "xunit.extensibility.core": "[2.1.0-rc1-build3168]"
         },
         "compile": {
-          "lib/dnxcore50/xunit.execution.dnx.dll": {}
+          "lib/dotnet/xunit.execution.dotnet.dll": {}
         },
         "runtime": {
-          "lib/dnxcore50/xunit.execution.dnx.dll": {}
+          "lib/dotnet/xunit.execution.dotnet.dll": {}
         }
       },
-      "xunit.netcore.extensions/1.0.0-prerelease-00085": {
+      "xunit.netcore.extensions/1.0.0-prerelease-00090": {
         "type": "package",
         "dependencies": {
           "System.Diagnostics.Debug": "4.0.10",
@@ -409,6 +520,25 @@
     }
   },
   "libraries": {
+    "Microsoft.DotNet.xunit.performance/1.0.0-alpha-build0014": {
+      "type": "package",
+      "sha512": "NCrgkMUcuMy3T5PY9kcBFpRyN/HrUyHsSxvdyq426iTZj2pG+6odaztW5BrQov3gPEXM5cPx4+64djl4sC8/nw==",
+      "files": [
+        "lib/dotnet/xunit.performance.core.dll",
+        "lib/dotnet/xunit.performance.core.pdb",
+        "lib/dotnet/xunit.performance.core.XML",
+        "lib/dotnet/xunit.performance.execution.dotnet.dll",
+        "lib/dotnet/xunit.performance.execution.dotnet.pdb",
+        "lib/net46/xunit.performance.core.dll",
+        "lib/net46/xunit.performance.core.pdb",
+        "lib/net46/xunit.performance.core.XML",
+        "lib/net46/xunit.performance.execution.desktop.dll",
+        "lib/net46/xunit.performance.execution.desktop.pdb",
+        "Microsoft.DotNet.xunit.performance.1.0.0-alpha-build0014.nupkg",
+        "Microsoft.DotNet.xunit.performance.1.0.0-alpha-build0014.nupkg.sha512",
+        "Microsoft.DotNet.xunit.performance.nuspec"
+      ]
+    },
     "System.Collections/4.0.10": {
       "type": "package",
       "serviceable": true,
@@ -477,6 +607,40 @@
         "System.Diagnostics.Debug.nuspec"
       ]
     },
+    "System.Diagnostics.Tracing/4.0.20": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "gn/wexGHc35Fv++5L1gYHMY5g25COfiZ0PGrL+3PfwzoJd4X2LbTAm/U8d385SI6BKQBI/z4dQfvneS9J27+Tw==",
+      "files": [
+        "lib/DNXCore50/System.Diagnostics.Tracing.dll",
+        "lib/MonoAndroid10/_._",
+        "lib/MonoTouch10/_._",
+        "lib/net46/_._",
+        "lib/netcore50/System.Diagnostics.Tracing.dll",
+        "lib/xamarinios10/_._",
+        "lib/xamarinmac20/_._",
+        "ref/dotnet/de/System.Diagnostics.Tracing.xml",
+        "ref/dotnet/es/System.Diagnostics.Tracing.xml",
+        "ref/dotnet/fr/System.Diagnostics.Tracing.xml",
+        "ref/dotnet/it/System.Diagnostics.Tracing.xml",
+        "ref/dotnet/ja/System.Diagnostics.Tracing.xml",
+        "ref/dotnet/ko/System.Diagnostics.Tracing.xml",
+        "ref/dotnet/ru/System.Diagnostics.Tracing.xml",
+        "ref/dotnet/System.Diagnostics.Tracing.dll",
+        "ref/dotnet/System.Diagnostics.Tracing.xml",
+        "ref/dotnet/zh-hans/System.Diagnostics.Tracing.xml",
+        "ref/dotnet/zh-hant/System.Diagnostics.Tracing.xml",
+        "ref/MonoAndroid10/_._",
+        "ref/MonoTouch10/_._",
+        "ref/net46/_._",
+        "ref/xamarinios10/_._",
+        "ref/xamarinmac20/_._",
+        "runtimes/win8-aot/lib/netcore50/System.Diagnostics.Tracing.dll",
+        "System.Diagnostics.Tracing.4.0.20.nupkg",
+        "System.Diagnostics.Tracing.4.0.20.nupkg.sha512",
+        "System.Diagnostics.Tracing.nuspec"
+      ]
+    },
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@@ -642,6 +806,102 @@
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       ]
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+    "System.Linq.Expressions/4.0.0": {
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+        "lib/xamarinmac20/_._",
+        "License.rtf",
+        "ref/dotnet/de/System.Linq.Expressions.xml",
+        "ref/dotnet/es/System.Linq.Expressions.xml",
+        "ref/dotnet/fr/System.Linq.Expressions.xml",
+        "ref/dotnet/it/System.Linq.Expressions.xml",
+        "ref/dotnet/ja/System.Linq.Expressions.xml",
+        "ref/dotnet/ko/System.Linq.Expressions.xml",
+        "ref/dotnet/ru/System.Linq.Expressions.xml",
+        "ref/dotnet/System.Linq.Expressions.dll",
+        "ref/dotnet/System.Linq.Expressions.xml",
+        "ref/dotnet/zh-hans/System.Linq.Expressions.xml",
+        "ref/dotnet/zh-hant/System.Linq.Expressions.xml",
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+        "ref/MonoTouch10/_._",
+        "ref/net45/_._",
+        "ref/netcore50/de/System.Linq.Expressions.xml",
+        "ref/netcore50/es/System.Linq.Expressions.xml",
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