# UNDF: UNDF-2026-000000966
--- a/apps/openmw/mwrender/objectpaging.cpp
+++ b/apps/openmw/mwrender/objectpaging.cpp
@@ -1,4 +1,5 @@
 #include "objectpaging.hpp"
+#include <unordered_set>

 // ...existing includes...

@@ -555,6 +556,12 @@
+                    // Build mMovedRefs lookup set once per cell for O(1) membership check.
+                    std::unordered_set<ESM::RefNum, ESM::RefNum::HashPair> movedRefSet;
+                    movedRefSet.reserve(cell->mMovedRefs.size());
+                    for (const auto& moved : cell->mMovedRefs)
+                        movedRefSet.insert(moved.mRefNum);
+
                     {
                         try
                         {
@@ -573,8 +580,7 @@
                                 if (moved)
                                     continue;

-                                if (std::find(cell->mMovedRefs.begin(), cell->mMovedRefs.end(), ref.mRefNum)
-                                    != cell->mMovedRefs.end())
+                                if (movedRefSet.count(ref.mRefNum))
                                     continue;

                                 int type = store.findStatic(ref.mRefID);