Cursor Helper (Renderer) making UI unresponsive

[jamesdolan]

Describe the Bug

Cursor becomes completely unresponsive/frozen sometimes. With “Cursor Helper (renderer)” >100% CPU and memory slowly growing beyond 4GB. This is happening on multiple machines and projects, and there are old closed threads complaining about similar things without resolution, so I think this is fairly widespread.

Side Note: I had a much more complete bug report complete with profiling data, but your bug report system erased it all when I tried to submit since profile data was >32000 characters.

Steps to Reproduce

No idea, seems to only happen when Chat Window is open, but beyond that kind of random.

Expected Behavior

Always be responsive.

Screenshots / Screen Recordings

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.2.4 (Universal)
VSCode Version: 1.99.3
Commit: a8e95743c5268be73767c46944a71f4465d05c90
Date: 2025-07-10T16:55:16.443Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.5.0

Does this stop you from using Cursor

Yes - Cursor is unusable

[sanjeed5]

Thanks for reporting this. Please try these steps:

• Update to the latest version (current: 1.4.5). You’re on 1.2.4, and several performance issues have been addressed in recent updates.
• Check out Cursor – Common Issues

Please let us know if this still happens after updating and trying these steps.