Cursor extension host crashing on large projects

Describe the Bug

I’ve been facing this issue for quite some releases, right when the new pricing came in. Just to give you idea of time span.
Bug is when I’m working on a large project, like many files, especially python, extension host randomly crashes a lot of time.
On smaller projects it’s not an issue, all works great. But the large project is my job one, for which if, I disable python then cursor works fine, but that beats the whole purpose for me if I can’t use basic language functions and pylance.

Steps to Reproduce

On large projects, where you have 4-5 files opened, and you are going to function or class definitions, extension host crashes.
Happens more than 5 times in some minutes.

Expected Behavior

Extension host shouldn’t randomly crash like.

Operating System

Linux

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.2.4
VSCode Version: 1.99.3
Commit: a8e95743c5268be73767c46944a71f4465d05c90
Date: 2025-07-10T16:59:43.242Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Linux x64 6.15.6-zen1-1-zen

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

I’m facing the same problem. This was working fine and it seems to be working fine for other teammates but my cursor started to display this error for big projects.

I’ve tried to reinstall, start with a clean profile, downgrade version but nothing seems to work.

Any help appreciated!

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

2 Likes

After trying almost everything only one thing worked out for me and it was to access User settings in cursor (cmd + shift + p → Open User Settings (JSON) ) and then cut all the settings and save with none. Restart cursor and the problem was gone.
Then I’ve pasted all the settings back and restarted cursor and everything started to work normally.

Really weird issue and I lack a proper explanation to this.

1 Like

For me, I turned of pylance, switched to pyrefly and anysphere’s python extension. For now it’s stable but if crashes I’ll have to try your solution.

This topic was automatically closed 22 days after the last reply. New replies are no longer allowed.