diff --git a/packages/fineui/src/base/list/virtualgrouplist.js b/packages/fineui/src/base/list/virtualgrouplist.js
index caf29c909..bdccaed3d 100644
--- a/packages/fineui/src/base/list/virtualgrouplist.js
+++ b/packages/fineui/src/base/list/virtualgrouplist.js
@@ -84,8 +84,10 @@ export class VirtualGroupList extends Widget {
             o.scrollTop = this.element.scrollTop();
             if (!this.ticking) {
                 requestAnimationFrame(() => {
+                    const start = new Date().getTime();
                     this._calculateBlocksToRender();
                     this.ticking = false;
+                    console.log(new Date().getTime() - start);
                 });
                 this.ticking = true;
             }