Cursor very laggy

Support Bug Reports
23

Yeah seriously, how this is not being fixed boggles the mind, even Windsurf has this problem. It seems to be the long chats.

Very amateur bug on the part of Cursor. Seems they’ve been vibe coding too much lol, like learn some basic design patterns and SWE principles.

24

Same here. Cursor has gotten VERY laggy the past week or two and keeps needing reopened.

25

@saidattax @Jayant-WebDev Sometimes I ask myself fine, I can manage, but what about the Cursor employees who use Cursor to build Cursor? Doesn’t it freeze for them? Don’t they go crazy from it?

26

Yes we use Cursor every day to build Cursor. But this problem seems to be worse on Linux/Windows, and many of us use Mac. Even our Linux and Windows devs don’t see issues this bad for some reason :thinking:

But we are investigating all these performance issues and have made many fixes already.

Please try the latest fixes available in Cursor Settings > Beta > Update Access: Early Access

27

This was plaguing my team and I starting about a week ago, but in short testing whatever was in Early Access seems to have improved it/fixed it for now. Will update if that is not the case moving forward.

28

This happens to me aswell for a while now, freezes and lags in the software itself, takes ages for the AI to respond in the chats, looping in the chats and inability to complete a file-rewrite which fails over and over due to failure in Edit. this must be fixed asap.

29

Describe the Bug

The latest windows feels significantly slow:

  • mem usage up 33% from baseline workload
  • frequent lag spikes on everything from syntax highlighting to +300msec on CTRL+P to find files
  • cursor tab will leave residual completion as uneditable, empty space which only goes away after deleting the surrounding block
  • ctrl+K “jankiness”

Steps to Reproduce

342 Indexed files

Expected Behavior

Not like this

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

My cursor version is >>>>> 1.4.3

Does this stop you from using Cursor

No - Cursor works, but with this issue

30

This should be resolved in v1.4.5 which was released today.

31

Can you tell us exactly what was changed ?

32

Thank you this build is so much better!

33

Yes 1.4.5 is MUCH better! I have still had it lag (pauses for a few seconds here and there) , and one time i had it completely lock up for about 20 seconds but it came out of it ok. It also still lags some when the agent is working , but it seems like the massive insane lag is gone or reduced enough to not be noticable. I can only tell after i leave it open for a few days while working to see if it really is fixed. But either way i already notice a massive improvement, finally, keep up the fixes!

34

I am still experiencing very sluggish UI, specifically on Window even at 1.5.5. How can I submit additional logs?

35

hi @GCosta lets debug first without logs.

  • Do you have any processes running in terminal within Cursor?
  • Does this also occur on a new project? (would indicate large chat storage)
  • Does this occur when you run with extensions disabled? cursor --disable-extensions

Please explain your usage more detailed, e.g. if you use Remote SSH, WSL, …

I will check with team about logs.

36

Hi Condor,

  • No terminals processes running.
  • It does happen on new projects as well, even ones that no messages have been sent yet.
  • Disabling all extensions did not help
  • It is all local development native Windows - no SSH or WSL

It does not happen with VS code or other forks.

It is very noticeable if I am scrolling through a file for example, it almost feels like it is trying to render what is coming next then it will freeze then allow me to scroll.

I will try to check if I am able to reproduce on another Windows machine to make sure it’s not something on my end.

Thank you.

38

@tmm1 which additional info would you need to debug this?

39

>Developer: Start CPU Profiler

40

While the 1.4.5 fixed a lot of the lag, it still lags when there’s a lot of chats but more like.. every so often it stops for 2-3s then comes back. Deleting old chats helps, although shouldn’t be necessary.. This lag was like 50x worse before the changes in 1.4.5 , it’s not ultra annoying to the point i can’t use the app any more but it still there. Hopefully they will continue to work on that.
Try deleting many old chats and starting a new one in your current session and see if that fixes the lag, if it does then it’s the same issue

41

any update on it?

I’ve been experiencing severe lag since uninstalling the ms dev container as instructed by Cursor v1.5.9. Also, the Cursor seems to be interfering with the chrome browser, and using the browser while remotely accessing the Cursor causes similar lag.

43

I’ve been having pretty mad input lag which gets worse after

  1. Having a project open for a while
  2. macOS going to sleep (or, perhaps, just Cursor being open for a long while - since my mac goes to sleep when I’m away for a long time)

“Reload Window” gives instant improvement, although not back to NO input lag.

I’ve tried everything, including setting extensions.experimental.affinity to a different process for each extension:

	"extensions.experimental.affinity": {
		// "gregoire.dance": 1,
		"svelte.svelte-vscode": 2,
		"bradlc.vscode-tailwindcss": 3,
		"rust-lang.rust-analyzer": 4,
		"anysphere.cursor-always-local": 5,
		"anysphere.cursor-retrieval": 6,
		"anysphere.cursor-tokenize": 7,
		"anysphere.cursor-shadow-workspace": 8,
		"vscode.typescript-language-features": 9,
		"anysphere.cursor-deeplink": 10,
		"anysphere.cursor-file-service": 11,
		"esbenp.prettier-vscode": 12
	},
44

@merlin.audio please share here the Cursor version as full block under About.