Impossible to work with Jupyter Notebook

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

The output of the jupyter notebooks are often not properly shown.
Memory leak, cursor uses up to 10GB for a (simple) jupyter notebook…

EVERYTHING in the CURSOR UI has a 10 second delay…

It is unacceptable to have such behavior in a software that is being used for WORK.

TEST the ide before shipping!!! stop vibe coding.

Steps to Reproduce

Use a jupyter notebook

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.1.39 (Universal)
VSCode Version: 1.105.1
Commit: 60d42bed27e5775c43ec0428d8c653c49e58e260
Date: 2025-11-27T02:30:49.286Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 24.6.0

Does this stop you from using Cursor

Yes - Cursor is unusable

2

Hey, thanks for the report. Let’s dig into this performance issue.

Please run these diagnostic steps:

  1. Extension-free test:
    Run in terminal: cursor --disable-extensions
    Do memory usage and latency issues persist?

  2. Process Explorer:
    CMD+Shift+P → “Developer: Open Process Explorer”
    Take a screenshot when load is high and share it here

  3. Console errors:
    Help → Toggle Developer Tools → Console - do you see any errors? If yes, please share a screenshot

Also helpful to know:

  • Which extensions are installed (especially anything Jupyter-related)?
  • What’s the size of your notebook file?
  • Does the issue appear right when opening the notebook or only after certain actions?

Please share the results of these checks.