Editor window got very laggy in long conversation context

Describe the Bug

I’m using cursor to finish a demo project, and it’s a little bit complicated. So the conversation context is very long (tens of rounds, and 25 tool calls in every round).

And cursor editor window becomes very laggy, 20+ fps when scrolling.

If I close the AI panel, it will be normal, 120 fps.

Steps to Reproduce

It’s hard to reproduce, you need a very long single conversation context.

Expected Behavior

Although the conversation is very long, cursor has limited it in UI, so it should not be so laggy.

Screenshots / Screen Recordings

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.1.7 (Universal)
VSCode Version: 1.96.2
Commit: 7111807980fa9c93aedd455ffa44b682c0dc1350
Date: 2025-07-01T07:26:06.233Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.3.0

Does this stop you from using Cursor

No - Cursor works, but with this issue

1 Like