Cursor becoming unresponsive with longer chats

amritashan · July 30, 2025, 8:47am

Hi @condor , thank you for your response.

i tried out what you had asked for:

--disable-extensions: this did not work directly:

$ ./cursor.AppImage --disable-extensions

The setuid sandbox is not running as root. Common causes:
  * An unprivileged process using ptrace on it, like a debugger.
  * A parent process set prctl(PR_SET_NO_NEW_PRIVS, ...)
Failed to move to new namespace: PID namespaces supported, Network namespace supported, but failed: errno = Operation not permitted
[339083:0730/140715.165148:FATAL:zygote_host_impl_linux.cc(207)] Check failed: . : Invalid argument (22)
Trace/breakpoint trap (core dumped)

I googled and found that i need to add --no-sandbox as well. I tried that out and it had a good start, but after a minute it was back to the laggy self.

I did have the process explorer on the side. everytime the IDE lagged, i could see that the CPU usage against the window got up, but then, it went up even when i am just typing something in the buffer.

Here’s what it looked like.

This does not look to be a problem because the CPU usage went up to 12 or 15 when I was typing normally. I also noticed that sometimes when the IDE would hang, the process explorer would hang as well and then when it unfroze the process explorer would update the numbers.

Can I help you with any other diagnostics?

Thanks for looking into this.

condor · July 30, 2025, 8:55am

Thanks for the details, could you confirm if you are on the latest version 1.3.5? We released an update yesterday.

For the Cursor window, i see it used 600MB memory, is that a larger HTML file?
Have a look also at Logs in Command Palette > Open Logs Folder and post any errors here.(you can redact sensitive paths)
Is Cursor or project in a folder thats mounted from network drive?

kjalwyn · July 30, 2025, 12:51pm

Looks like others are experiencing something similar with vscode so might be an upsteram issue - Vscode very laggy after update 2025/07/22 · Issue #257627 · microsoft/vscode · GitHub

webdo · July 30, 2025, 2:09pm

@condor Happens with all 1.3 versions, currently on 1.3.5

As @ngynlaam mentionned It do seem to be related to ALT+Tab, I can use it fine for a while but sometimes when I Alt Tab it starts lagging like crazy.

cboseb · July 30, 2025, 3:15pm

Same issue persists since the 1.3.5 (Universal) update. I’m experiencing significant problems with agent mode - it’s consistently getting stuck in loops or losing connection.

I’ve also had to deactivate the to-do list mode because the agent always gets stuck in a loop within a task, and there’s no way to wake it up since any questions (like asking if it’s stuck) just get added to the queue instead of interrupting the agent.

Version: 1.3.5 (Universal)
VSCode Version: 1.99.3
Commit: 9f33c2e793460d00cf95c06d957e1d1b8135fad0
Date: 2025-07-30T00:25:11.596Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.5.0

amritashan · July 30, 2025, 3:22pm

Hi @condor, the report above was with 1.3.5.

I did grab that update hoping it would fix the problem, but it did not.

Here’s what I have in About:

Version: 1.3.5
VSCode Version: 1.99.3
Commit: 9f33c2e793460d00cf95c06d957e1d1b8135fad0
Date: 2025-07-30T00:32:27.448Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Linux x64 6.8.0-64-generic

Please let me know if there is anything else I can help with.

Thanks.

amritashan · July 30, 2025, 3:57pm

ah, I didn’t see your message about the logs, @condor

I could see these logs, with main.log and sharedprocess.log updated frequently.

The main.log mostly has these:

2025-07-30 21:18:47.088 [warning] No ptyHost heartbeat after 6 seconds
2025-07-30 21:19:47.326 [warning] No ptyHost heartbeat after 6 seconds
2025-07-30 21:20:47.650 [warning] No ptyHost heartbeat after 6 seconds
2025-07-30 21:21:47.936 [warning] No ptyHost heartbeat after 6 seconds
2025-07-30 21:22:48.316 [info] update#setState checking for updates
2025-07-30 21:22:48.328 [warning] No ptyHost heartbeat after 6 seconds
2025-07-30 21:22:49.396 [info] update#setState idle

The line “No ptyHost heartbeat after 6 seconds” is repeated several times and is often broken by “checking for updates”

sharedprocess.log has this content overall:

2025-07-30 20:17:46.124 [info] Getting extensions control
2025-07-30 20:22:46.464 [info] Getting extensions control
2025-07-30 20:27:46.739 [info] Getting extensions control
2025-07-30 20:32:47.044 [info] Getting extensions control
2025-07-30 20:37:47.373 [info] Getting extensions control
2025-07-30 20:42:47.668 [info] Getting extensions control
2025-07-30 20:47:47.994 [info] Getting extensions control
2025-07-30 20:52:48.334 [info] Getting extensions control
2025-07-30 20:57:49.158 [info] Getting extensions control
2025-07-30 21:02:49.429 [info] Getting extensions control
2025-07-30 21:07:49.706 [info] Getting extensions control
2025-07-30 21:12:51.276 [info] Getting extensions control
2025-07-30 21:17:50.254 [info] Getting extensions control
2025-07-30 21:22:50.575 [info] Getting extensions control

Thanks.

condor · July 31, 2025, 7:21am

Thank you all for the details and info on freezes. Forwarding it to our dev team for checks.

amritashan · July 31, 2025, 11:14am

Thank you, @condor

I got the latest update today and things have gotten worse now.

I keep getting this now quite frequently. It was there yesterday too, but not so much.

I’m switching over to VSCode now as I can’t use Cursor anymore, hoping this is fixed quickly.

My current version:

Version: 1.3.6
VSCode Version: 1.99.3
Commit: 68b8fe7396ea37d8acdaaaa08ba316ba359a4160
Date: 2025-07-30T18:07:31.095Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Linux x64 6.8.0-64-generic

webdo · July 31, 2025, 6:12pm

It seems to have been fixed in 1.3.6 or 1.3.7. I’ve been using cursor all day without issue.

Azura720 · August 1, 2025, 4:34am

It seems to be resolved for me as well after updating to v1.3.7. I hope it doesn’t come back in the future, as it was very frustrating.

amritashan · August 1, 2025, 8:18am

The latest update didn’t change anything for me.

Still getting this:

Version: 1.3.7
VSCode Version: 1.99.3
Commit: 5d56108ff2401c28f239aa2a527ef424ce7719a0
Date: 2025-07-31T04:12:28.991Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Linux x64 6.8.0-71-generic

condor · August 1, 2025, 9:36am

We launched 1.3.8 with several improvements for performance. Could you kindly try it out and let us know if you still have that issue?

cc @andrewh

saymondamasio · August 1, 2025, 2:46pm

Has this version for Windows been published yet? I have the same problem

currently at version 1.3.7

Daniel_Rodriguez · August 1, 2025, 2:47pm

I have the same problem in Windows; the programme freezes for 10 to 15 seconds. My project is large, but this does not happen with other IDEs.

Every time I return to the Cursor tab, it freezes for several seconds and I cannot use it.

condor · August 1, 2025, 3:07pm

It may be still rolling out to all users.

gsvendramini · July 26, 2025, 9:09pm

Describe the Bug

Cursor is unresponsive - freezing

All the time I’m getting a OS dialog that cursor is unresponsive, I have the button Wait or Terminate

I was inspecting this file .config/Cursor/logs/20250726T123110/window1/renderer.log
And I noticed lot of these errors

[info] Extension host (Remote) is unresponsive.
[error] [1b4] potential listener LEAK detected, having 175 listeners already. MOST frequent listener (1)
[error] Invoking deltaDecorations recursively could lead to leaking decorations.: Error: Invoking deltaDecorations recursively could lead to leaking decorations.

2025-07-26 17:41:05.671 [info] Extension host (Remote) is unresponsive.
2025-07-26 17:41:05.737 [info] Extension host (Remote) is responsive.
2025-07-26 17:42:05.673 [info] Extension host (Remote) is unresponsive.
2025-07-26 17:42:05.751 [info] Extension host (Remote) is responsive.
2025-07-26 17:42:41.949 [info] Extension host (Remote) is unresponsive.
2025-07-26 17:42:42.229 [info] Extension host (Remote) is responsive.
2025-07-26 17:48:07.737 [error] [8ad] potential listener LEAK detected, having 175 listeners already. MOST frequent listener (1):: Error
    at Zml.create (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:47:11683)
    at WAt.q [as onDidChangeIdeEditorsState] (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:1382)
    at Object.fn (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:4602:13611)
    at Jfo (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:278:1030)
    at B4e (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:278:784)
    at qCt (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:278:2588)
    at t$c (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:278:4026)
    at vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:278:3449
    at _W (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:278:2766)
    at Z_c (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:278:3442)
    at _W (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:278:2777)
    at tN (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:276:22512)
    at Ahs.r [as setData] (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:278:17382)
    at setData (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:493:23863)
    at vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:1420:509
    at ug.updateComposerDataSetStore (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:1413:40628)
    at vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:52:40309
    at PGn (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:52:39995)
    at Z9 (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:52:39956)
    at n.value (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:52:40298)
    at Gnn.getCodeChunksFromFolders (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:1420:458)
    at async Gnn.getCodeChunks (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:1418:1594)
    at async Promise.all (index 1)
    at async nse.getNewMessageContext (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:2658:8400)
    at async nse.submitPromptDryRun (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:2657:3992)
    at async Zgn.updatePromptDryRunInfo (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:5481:3689) [8ad] potential listener LEAK detected, having 175 listeners already. MOST frequent listener (1):

2025-07-26 17:54:09.468 [info] Extension host (Remote) is unresponsive.
2025-07-26 17:54:09.513 [info] Extension host (Remote) is responsive.
2025-07-26 17:54:09.571 [error] [Extension Host] Error: Start of the range is outside the file.
	at o (/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/extensions/cursor-always-local/dist/main.js:2:6628)
	at t.changeModel (/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/extensions/cursor-always-local/dist/main.js:2:7800)
	at t.formatDiffHistory (/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/extensions/cursor-always-local/dist/main.js:2:1387609)
	at async Promise.allSettled (index 0)
	at async hve.$getEverythingAllLocalProviderRunCommand (file:///tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:157:1404033)
2025-07-26 17:54:21.969 [error] LinkedMap got modified during iteration.: Error: LinkedMap got modified during iteration.
    at Object.next (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:27:11729)
    at Wyt.value (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:1413:22267)
    at we.B (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2398)
    at we.C (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2468)
    at we.fire (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2686)
    at iZs.I (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7016:12479)
    at vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7016:11493 LinkedMap got modified during iteration.
2025-07-26 17:54:21.971 [error] Tool call errored or timed out: Error: Tool call errored or timed out
    at AbortSignal.<anonymous> (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:4302:7475)
    at Unn.cleanupComposerTerminals (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:1413:25539)
    at Wyt.value (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:1413:22312)
    at we.B (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2398)
    at we.C (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2468)
    at we.fire (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:49:2686)
    at iZs.I (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7016:12479)
    at vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:7016:11493 Tool call errored or timed out
2025-07-26 17:54:24.954 [error] Cannot read properties of undefined (reading 'dimensions'): TypeError: Cannot read properties of undefined (reading 'dimensions')
    at get dimensions (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/node_modules/@xterm/xterm/lib/xterm.js:1:107439)
    at u.scrollLines (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/node_modules/@xterm/xterm/lib/xterm.js:1:50958)
    at x.scrollLines (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/node_modules/@xterm/xterm/lib/xterm.js:1:27874)
    at x.scrollToBottom (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/node_modules/@xterm/xterm/lib/xterm.js:1:28146)
    at u.scrollToBottom (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/node_modules/@xterm/xterm/lib/xterm.js:1:484988)
    at qDe.scrollToBottom (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:4685:14671)
    at wse.sendText (vscode-file://vscode-app/tmp/.mount_cursorNueQhe/usr/share/cursor/resources/app/out/vs/workbench/workbench.desktop.main.js:4705:9753) Cannot read properties of undefined (reading 'dimensions')
2025-07-26 17:54:24.974 [error] undefined

Steps to Reproduce

Not sure, it starts fine, after some minutes working starts freezing e popup the OS not responding, then Cursor become unusable, sometimes > Reload Window give me some minutes to work, but most of the time I have to restart my laptop to have more 30min-1h of work.

Operating System

Linux

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.3.2
VSCode Version: 1.99.3
Commit: 7db9f9f3f612efbde8f318c1a7951aa0926fc1d0
Date: 2025-07-24T22:20:09.787Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Linux x64 6.15.8-arch1-1

Additional Information

I’m using DevContainer

ArchLinux 6.15.8-arch1-1
Hyprland 0.50.1 (Wayland)
zsh 5.9
kitty 0.42.2

Does this stop you from using Cursor

Yes - Cursor is unusable

RafeSacks · July 26, 2025, 9:26pm

FWIW: I’ve been using it non-stop for a few hours now and have not had any issues. Auto is mostly using Claude.

gsvendramini · July 26, 2025, 11:17pm

Thanks for sharing Rafe, but I think is not related to non-stop, my Cursor freezes even when I only use the Ask mode =/

jokerfool · July 27, 2025, 5:20am

Have you tried starting a new chat?

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