# UNDF: UNDF-2026-000001217
--- a/plugins/extensions/resourcemanager/dlg_create_bundle.cpp
+++ b/plugins/extensions/resourcemanager/dlg_create_bundle.cpp
@@ -185,9 +185,14 @@ bool DlgCreateBundle::putResourcesInTheBundle(KoResourceBundleSP bundle)
     QList<int> selectedResourcesIds = m_pageResourceChooser->getSelectedResourcesIds();

     QStack<int> allResourcesIds;
+    // Parallel QSet for O(1) dedup — QStack::contains is O(N), causing O(K^2) for K resources.
+    QSet<int> seenResourceIds;
     Q_FOREACH(int id, selectedResourcesIds) {
         allResourcesIds << id;
+        seenResourceIds.insert(id);
     }

@@ -239,8 +244,9 @@ bool DlgCreateBundle::putResourcesInTheBundle(KoResourceBundleSP bundle)
                 KoResourceSP resource = linkedResource.resource();

                 if (!resource) {
                     qWarning() << "WARNING: DlgCreateBundle::putResourcesInTheBundle couldn't fetch a linked resource" << linkedResource.signature();
                     continue;
                 }

-                if (!allResourcesIds.contains(resource->resourceId())) {
+                if (!seenResourceIds.contains(resource->resourceId())) {
+                    seenResourceIds.insert(resource->resourceId());
                     allResourcesIds.append(resource->resourceId());
                 }
             }