Poor performance for Python code navigation after upgrade

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Extremely poor performance navigating Python codebase

Steps to Reproduce

  1. Upgrade to the latest version of Cursor.
  2. Try to navigate a Python codebase which already existed, such as finding references to a class method
  3. Performance is poor, sometimes taking a minute to complete.

Expected Behavior

Performance should be comparable to before the upgrade

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.5.11
VSCode Version: 1.99.3
Commit: 2f2737de9aa376933d975ae30290447c910fdf40
Date: 2025-09-05T03:48:32.332Z
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.6.0

Does this stop you from using Cursor

Yes - Cursor is unusable

3

Hi @Robert_Blankenship, could you try adding paths to cursorpyright.analysis.exclude? This will limit the # of files that are getting analyzed, which should help improve performance.

4

I didn’t need to exclude any paths before. Could you explain why this is necessary now?

Also, it would be good to provide guidelines for how many Python files Cursor supports.

6

We don’t have a hard limit on the # of files; it will depend on the resources of your computer.

The implementation in the new extension is different, so having excluded folders will help with performance.

7

Could you provide any info about how to debug it? Logs to look for? How to know which folders are causing the problem?

TBH, I would prefer to revert, if possible.

9

The “Cursor - Pyright” and “basedpyright” output consoles would contain logs for the Python language server.

10

Even after reducing it to 800 files it’s still slow:

[Info - 12:30:07 PM] Found 837 source files

And that’s after ignoring my .venv folder, which doesn’t feel super great as I’d like to freely navigate between project source and dependencies

12

+1. Me and my team having same issue post update. Unusable unfortunately. We have a python mono-repo & pretty sure any enterprise level company writing python code outside of a pet project will hit this if the performance is bad on 800 files. Especially because my dev machine is pretty beefy…

@ravirahman :

  1. Why was Pylance removed in favor of Anysphere Python
  2. Is Cursor aware of this issue and the severity and is there any plan / path to improve the performance? Need to know so I can advise my team how much to invest in other alternatives.

I do not have this issue with any other IDE which suggests the performance is miles off on Anysphere

1 Like