From ada20bed23aaaf470d89e1d215f400c55e4cda11 Mon Sep 17 00:00:00 2001
From: Mark Tucker <mtucker@sidefx.com>
Date: Mon, 20 Apr 2020 16:23:26 -0400
Subject: [PATCH] Clear primInfo->extraDependencies in _RemoveDependencies
 after they have been added to _dependenciesToRemove. Previously the contents
 of this set were never cleared, and removing many prims would add N copies of
 the N extrDependencies to the _dependenciesToRemove vector, chewing up
 enormous time and memory.

---
 pxr/usdImaging/usdImaging/indexProxy.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pxr/usdImaging/usdImaging/indexProxy.cpp b/pxr/usdImaging/usdImaging/indexProxy.cpp
index 86dce54ecf..73a059bb9d 100644
--- a/pxr/usdImaging/usdImaging/indexProxy.cpp
+++ b/pxr/usdImaging/usdImaging/indexProxy.cpp
@@ -115,6 +115,7 @@ UsdImagingIndexProxy::_RemoveDependencies(SdfPath const& cachePath)
             UsdImagingDelegate::_DependencyMap::value_type(
                 dep, cachePath));
     }
+    primInfo->extraDependencies.clear();
 }
 
 void