3 files changed, 37 insertions, 4 deletions
diff --git a/source/blender/io/usd/intern/usd_capi_import.cc b/source/blender/io/usd/intern/usd_capi_import.cc
index 13ae6f4d4c0..03af3aed2d0 100644
--- a/source/blender/io/usd/intern/usd_capi_import.cc
+++ b/source/blender/io/usd/intern/usd_capi_import.cc
@@ -218,6 +218,7 @@ static void import_startjob(void *customdata, short *stop, short *do_update, flo
     data->scene->r.efra = stage->GetEndTimeCode();
   }
 
+  *data->do_update = true;
   *data->progress = 0.15f;
 
   USDStageReader *archive = new USDStageReader(stage, data->params, data->settings);
@@ -226,13 +227,32 @@ static void import_startjob(void *customdata, short *stop, short *do_update, flo
 
   archive->collect_readers(data->bmain);
 
+  *data->do_update = true;
   *data->progress = 0.2f;
 
   const float size = static_cast<float>(archive->readers().size());
   size_t i = 0;
 
-  /* Setup parenthood */
+  /* Sort readers by name: when creating a lot of objects in Blender,
+   * it is much faster if the order is sorted by name. */
+  archive->sort_readers();
+  *data->do_update = true;
+  *data->progress = 0.25f;
+
+  /* Create blender objects. */
+  for (USDPrimReader *reader : archive->readers()) {
+    if (!reader) {
+      continue;
+    }
+    reader->create_object(data->bmain, 0.0);
+    if ((++i & 1023) == 0) {
+      *data->do_update = true;
+      *data->progress = 0.25f + 0.25f * (i / size);
+    }
+  }
 
+  /* Setup parenthood and read actual object data. */
+  i = 0;
   for (USDPrimReader *reader : archive->readers()) {
 
     if (!reader) {
@@ -252,7 +272,7 @@ static void import_startjob(void *customdata, short *stop, short *do_update, flo
       ob->parent = parent->object();
     }
 
-    *data->progress = 0.2f + 0.8f * (++i / size);
+    *data->progress = 0.5f + 0.5f * (++i / size);
     *data->do_update = true;
 
     if (G.is_break) {
diff --git a/source/blender/io/usd/intern/usd_reader_stage.cc b/source/blender/io/usd/intern/usd_reader_stage.cc
index 583c58a1356..df75be849e2 100644
--- a/source/blender/io/usd/intern/usd_reader_stage.cc
+++ b/source/blender/io/usd/intern/usd_reader_stage.cc
@@ -28,6 +28,9 @@
 
 #include <iostream>
 
+#include "BLI_sort.hh"
+#include "BLI_string.h"
+
 namespace blender::io::usd {
 
 USDStageReader::USDStageReader(pxr::UsdStageRefPtr stage,
@@ -252,8 +255,6 @@ USDPrimReader *USDStageReader::collect_readers(Main *bmain, const pxr::UsdPrim &
     return nullptr;
   }
 
-  reader->create_object(bmain, 0.0);
-
   readers_.push_back(reader);
   reader->incref();
 
@@ -310,4 +311,14 @@ void USDStageReader::clear_readers()
   readers_.clear();
 }
 
+void USDStageReader::sort_readers()
+{
+  blender::parallel_sort(
+      readers_.begin(), readers_.end(), [](const USDPrimReader *a, const USDPrimReader *b) {
+        const char *na = a ? a->name().c_str() : "";
+        const char *nb = b ? b->name().c_str() : "";
+        return BLI_strcasecmp(na, nb) < 0;
+      });
+}
+
 }  // Namespace blender::io::usd
diff --git a/source/blender/io/usd/intern/usd_reader_stage.h b/source/blender/io/usd/intern/usd_reader_stage.h
index 0ed964c7679..5f4a343f874 100644
--- a/source/blender/io/usd/intern/usd_reader_stage.h
+++ b/source/blender/io/usd/intern/usd_reader_stage.h
@@ -63,6 +63,8 @@ class USDStageReader {
     return readers_;
   };
 
+  void sort_readers();
+
  private:
   USDPrimReader *collect_readers(Main *bmain, const pxr::UsdPrim &prim);