--- node_modules/jsdoc/lib/jsdoc/util/templateHelper.js.orig
+++ node_modules/jsdoc/lib/jsdoc/util/templateHelper.js
@@ -804,7 +804,27 @@
 
     return returnTypes;
 };
+
+// Cache for memberof index to speed up ancestor lookups
+let memberofIndex = null;
+
+function buildMemberofIndex(data) {
+    if (memberofIndex) {
+        return memberofIndex;
+    }
+
+    memberofIndex = new Map();
+    const allDoclets = data().get();
+
+    for (const doclet of allDoclets) {
+        if (doclet.longname) {
+            memberofIndex.set(doclet.longname, doclet);
+        }
+    }
 
+    return memberofIndex;
+}
+
 /**
  * Retrieve an ordered list of doclets for a symbol's ancestors.
  *
@@ -818,9 +838,13 @@
     let doc = doclet;
     let previousDoc;
 
+    // Build index once for all lookups
+    const index = buildMemberofIndex(data);
+
     while (doc) {
         previousDoc = doc;
-        doc = find(data, {longname: doc.memberof})[0];
+        // Use index instead of database query
+        doc = index.get(doc.memberof);
 
         // prevent infinite loop that can be caused by duplicated module definitions
         if (previousDoc === doc) {