I am using the newest version of Cursor on Ubuntu. if I open the app freshly it works for some time but after a while (maybe 1 or 2h of work) it slows down, everything takes much longer and it freezes in “thinking” or “this is taking longer than expected”.
When I run diagnostics when I open the app, everything is fine but when it laggs than it says that my internet buffes because of a proxy, but only after a while. But if I close the app and start new, everything is fine again.
Hey, could you share a few things so we can narrow this down?
Your exact Cursor version. Go to Help > About and copy the full version info.
Next time it slows down, open Process Explorer (Ctrl + Shift + P, then search for “Developer: Open Process Explorer”) and take a screenshot. Please focus on extensionHost and ptyHost memory usage.
Also take a screenshot of the diagnostics output when it’s in the broken state, the one showing proxy buffering.
It’s interesting that the proxy warning only shows up after extended use. It’s likely a symptom, not the root cause. It could be related to resources building up over time.
A couple things to try in the meantime:
Try disabling HTTP/2. Open App Settings Ctrl + , search for “HTTP/2”, and enable “Disable HTTP/2”. This can help with false proxy detection.
Test with extensions disabled. Run cursor --disable-extensions from the terminal and see if the slowdown still happens after 1 to 2 hours.
It only happend when I updated to 2.5, i was runnung 2.4 before. The taking longer than expected is also happeing, which many forum posts are about lately.
