I have had a lot of trouble with cursor for the last two weeks. It is taking ages (i.e. over 30 minutes!) to display any of my jupyter notebook files or answer any queries. It is a big folder. But I had no problems until two weeks and now I have to wait so long before I can open the files. Also, I have exactly the same issue with much smaller folders. Once it opens one successfully, all the problems go away and it goes back to normal, but this is incredibly frustrating and really delaying my work.
Hey, to narrow down the cause, we’ll need a bit of diagnostics:
Version and OS: open Cursor > About or Help > About and send your version and OS.
Notebook size: about how big are the files that open slowly? If the outputs include lots of embedded images or large data, the file can grow to tens of MB. Cursor won’t index files over 50 MB, and big notebooks can really slow down rendering.
Extensions: try launching Cursor with extensions disabled and see if it’s still slow:
cursor --disable-extensions
Jupyter and Python extensions are especially suspicious since they activate the first time you open an .ipynb. That could explain why the first file is slow and the next ones are fine. You can also enable Extension Monitor: Settings > Application > Experimental > Extension Monitor Enabled, then Cmd+Ctrl+Shift+P > Developer: Open Extension Monitor.
Process Explorer: Cmd+Ctrl+Shift+P > Developer: Open Process Explorer. Check what’s using CPU or RAM when it slows down, like extensionHost, ptyHost, or file watcher.
Are AI requests slow separately? If yes, go to Cursor Settings > Network > Run Diagnostics, and try turning on Disable HTTP/2. Use Cmd+Ctrl+, then search for HTTP/2. This is especially common on corporate networks, VPN, or Zscaler.
If AI requests hang, send the Request ID from one slow request: right side of the chat top right menu > Copy Request ID.
With that info, I can be more specific about what’s going on.