Where does the bug appear (feature/product)? Cursor IDE Describe the Bug In recent versions of Cursor, I’m finding that while the agent is producing tokens, the rest of the UI becomes extremely sluggish or non-responsive, including and especially the terminal. I don’t recall this being an issue in …

Hi @deanrie and thanks a lot for your support! My problem was 100% solved after I deactivated “System notifications” in Cursor settings. (I tried so many different things in console, logs, cpu, nividia, drivers, etc.. And finally I found someone on Cursor Forum who has this “known issue with Windo…

Hey, thanks for the report. A few things to check so we can narrow this down: Open Process Explorer (Ctrl + Shift + P > Developer: Open Process Explorer) and see which process spikes during agent token generation. Please pay special attention to extensionHost and ptyHost CPU and memory usage. T…

Process explorer while agent is generating code; terminal is frozen [螢幕快照 2026-03-13 16-59-38] [螢幕快照 2026-03-13 16-59-16] [螢幕快照 2026-03-13 16-59-35] Ubuntu 24.04, Gnome, Wayland

I see the screenshots, thanks. They’re really helpful. The main thing that stands out is that the window [2] process (the main renderer) is using 3 GB of memory, and the history shows spikes up to 30 GB. That’s not normal and it looks like a known memory leak in the renderer. One more thing: curso…

Where does the bug appear (feature/product)? Cursor IDE Describe the Bug Over the past several months, I have repeatedly noticed that Cursor’s performance is extremely poor in two areas, and the IDE freezes. The first issue is that as soon as files are being written, the entire IDE effectively “fr…

I have 1 minute freezes on Debian 13 with KDE Wayland. It’s maybe a problem with your fork of VSCODE / Electron and how throttling affects background tasks and UI rendering.. If i run an intensive cpu task in Cursor, then open chrome to do something else , then when the task finished, Cursor will f…

@User4 : What you’re describing, DOM overload with long context windows and freezes when writing files, matches what we’re seeing for the OP. This is a known renderer memory leak. As a workaround, close long chats and start new ones, and don’t stay in a single context window for too long. It’s not pe…

Cursor UI freezes up when agent is working

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miaohaha March 13, 2026, 5:00pm 4

Process explorer while agent is generating code; terminal is frozen

Ubuntu 24.04, Gnome, Wayland

Topic		Replies	Views
Cursor Performance after long tasks or writing files Bug Reports chat , performance	3	114	April 5, 2026
Cursor becomes ridiculously slow after a few hours of usage Bug Reports performance	14	5032	February 24, 2026
IDE freezes when window not active Bug Reports crashes , windows	3	88	March 5, 2026
Cursor IDE CPU spikes Bug Reports performance , linux	10	121	April 11, 2026
Reconnecting and resource usage Bug Reports performance , crashes	4	221	March 20, 2026

Cursor UI freezes up when agent is working

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