diff --git a/packages/virtualized-lists/Lists/ViewabilityHelper.js b/packages/virtualized-lists/Lists/ViewabilityHelper.js
index 5fc5addc11b..150d07363b2 100644
--- a/packages/virtualized-lists/Lists/ViewabilityHelper.js
+++ b/packages/virtualized-lists/Lists/ViewabilityHelper.js
@@ -302,9 +302,14 @@ class ViewabilityHelper {
     ) => ViewToken,
   ) {
     // Filter out indices that have gone out of view since this call was scheduled.
-    viewableIndicesToCheck = viewableIndicesToCheck.filter(ii =>
-      this._viewableIndices.includes(ii),
-    );
+    // Both call sites pass the array stored in `this._viewableIndices`, in which
+    // case every index is trivially still viewable and the O(n^2) filter can be
+    // skipped.
+    if (viewableIndicesToCheck !== this._viewableIndices) {
+      viewableIndicesToCheck = viewableIndicesToCheck.filter(ii =>
+        this._viewableIndices.includes(ii),
+      );
+    }
     const prevItems = this._viewableItems;
     const nextItems = new Map(
       viewableIndicesToCheck.map(ii => {