IMPORTANT: Cursor lag & unresponsiveness (AI works ok)

[feremabraz]

I’ve found that I’m certainly not the only one experiencing this, so I know that the problem isn’t my own machine.

I’ll leave this here so people know this keeps happening on newer versions too:

Cursor lagging to the point of uselessness

I can’t even scroll properly, it lags and lags. What’s going on! I close all tabs. I have to move back to vscode if this keeps up. So frustrating.

Exteme Lag in cursor mid project! Help!

Loving Cursor across the board, except that the lag makes it unusable for me as well. Adding my anecdotal story as a way to ping this thread. I’m on a 2024 m3 mac pro and am getting up to 20s lag clicking through to open files, hitting save (prompting the linter / prettier to run), waiting for the typescript checker to figure stuff out. It’s bad to the point that sometimes I’ll type out a variable name. I can see the red underline appear on the first letter (because the first letter isn’t a va…

@michael-wise

Deleting my entire chat and composer history fixed my Cursor window lagginess (I also killed/restarted all my in-window terminals before this as the first attempt).

There were a few items that took a while to delete. And clicking delete on one specific recent one lagged the window out for about a minute (it was a long convo, though some others were too).

TLDR deleting all my Cursor chat/composer histories fixed immense cursor window lag.

[feremabraz]

Follow up:

Deleting the entire chat and composer history DOES NOT fixes Cursor lagginess.
Same with deleting WorskpaceStorage.

Comments from the team or somebody responsible would be appreciated.

[feremabraz]

Follow up:

I tried everything I found at Cursor – Troubleshooting Guide

It got better, but it’s still largely unusable.

[deanrie]

Hey, have you also tried reinstalling Cursor? What do you see in the system processes? Is Cursor using up a lot of resources? Have you also tried starting it in safe mode with the command: cursor --disable-extensions?

[baronyoung]

I’m having issues as well. I’m using vscodevim, running on Ubuntu. When scrolling, moving between lines, etc. I often get 1-2 second hangs. Today it seems to be worse than ever. I’m not sure if it’s from the update from today or if I’m building up history or what.

[m6T]

Same here! The interface lag (on latest version + current Linux Mint) is getting increasingly bad. There are 2-5 seconds delay when I write prompts.
This is really frustrating and a bad experience overall.

[bconnorwhite]

This is likely due to terminal tool rendering:

Why Cursor Lags (and how to fix)

Describe the Bug As many other posts have noted Cursor can be extremely laggy when the chat window is open (often 50-100ms frames). I think this is mostly due to how Cursor renders terminal tool call output (although the chat window seems laggier than it needs to be in general so I could see this being a broader issue on different hardware). Steps to Reproduce In my experience the lag becomes noticeable in chats with terminal tool calls, even if the chat has a small number of turns. Empty chat…

[malcsi]

new cursor version this morning slowed stuff down especialy claude-sonnet 4 - don’t you guys test?