So, I love cursor, and honestly for me all but a few bugs are fixed, but what’s stopping me from using it is the HORRIBLE Lag. I’m talking I can’t even put in a few rules when I was trying to because it’s so laggy, I can’t type anywhere, can’t click because it’s always frozen. TL;DR: any ways to fix this awful lag and delay other than deleting conversations?

Hey, is this happening in all projects?

I only have one project, so I assume no. But I literally cannot access cursor most of the time, I cannot use it right now other than to simply type in a prompt and hit enter, and even then it’s taking a minute just to be able to type it in and press enter, often times even longer due to crashes. I’m paying 20 dollars a month for this, I know it’s buggy, but I should at least be able to use it which I’m unable to currently. It’s often restarting with the ‘oom’ error. The only problem right now is the horrible lag and crashes. Please, please come up with some solutions at the very least, I’ve worked on this project for months so I can’t simply abandon it. Here’s the error codes in toggle developer tools: Uncaught Error: [composer] No composer data handle found at Co.updateComposerDataSetStore (workbench.desktop.main.js:596:38154) at workbench.desktop.main.js:50:87377 at aN (workbench.desktop.main.js:50:87131) at s.value (workbench.desktop.main.js:50:87366) at Osi.triggerScrollToBottom (workbench.desktop.main.js:2925:15014) at workbench.desktop.main.js:2925:10297 workbench.desktop.main.js:2285 [Extension Host] (node:25872) ExperimentalWarning: Use importAttributes instead of importAssertions (Use Cursor --trace-warnings ... to show where the warning was created) qEr @ workbench.desktop.main.js:2285 workbench.desktop.main.js:4808 Writing file file:///c%3A/Users/jj%20haenlein/.cursor/extensions/ms-vscode-remote.remote-wsl-0.81.8/dist/node/wslDaemon.js workbench.desktop.main.js:4808 Writing file file:///c%3A/Users/jj%20haenlein/.cursor/extensions/ms-vscode-remote.remote-wsl-0.81.8/dist/node/extension.js workbench.desktop.main.js:2876 Overwriting grammar scope name to file mapping for scope source.dart. Old grammar file: file:///c%3A/Users/jj%20haenlein/AppData/Local/Programs/cursor/resources/app/extensions/dart/syntaxes/dart.tmLanguage.json. New grammar file: file:///c%3A/Users/jj%20haenlein/.cursor/extensions/dart-code.dart-code-3.106.0/syntaxes/dart.json register @ workbench.desktop.main.js:2876 workbench.desktop.main.js:2876 Overwriting grammar scope name to file mapping for scope source.cmake. Old grammar file: file:///c%3A/Users/jj%20haenlein/.cursor/extensions/ms-vscode.cmake-tools-1.20.53/syntaxes/CMake.tmLanguage. New grammar file: file:///c%3A/Users/jj%20haenlein/.cursor/extensions/twxs.cmake-0.0.17/syntaxes/CMake.tmLanguage register @ workbench.desktop.main.js:2876 workbench.desktop.main.js:2876 Overwriting grammar scope name to file mapping for scope source.cmakecache. Old grammar file: file:///c%3A/Users/jj%20haenlein/.cursor/extensions/ms-vscode.cmake-tools-1.20.53/syntaxes/CMakeCache.tmLanguage. New grammar file: file:///c%3A/Users/jj%20haenlein/.cursor/extensions/twxs.cmake-0.0.17/syntaxes/CMakeCache.tmLanguage register @ workbench.desktop.main.js:2876 workbench.desktop.main.js:4996 Extension Host textMateTokenizationWorker.workerMain.js:31 Overwriting grammar scope name to file mapping for scope source.dart. Old grammar file: file:///c%3A/Users/jj%20haenlein/AppData/Local/Programs/cursor/resources/app/extensions/dart/syntaxes/dart.tmLanguage.json. New grammar file: file:///c%3A/Users/jj%20haenlein/.cursor/extensions/dart-code.dart-code-3.106.0/syntaxes/dart.json register @ textMateTokenizationWorker.workerMain.js:31 textMateTokenizationWorker.workerMain.js:31 Overwriting grammar scope name to file mapping for scope source.cmake. Old grammar file: file:///c%3A/Users/jj%20haenlein/.cursor/extensions/ms-vscode.cmake-tools-1.20.53/syntaxes/CMake.tmLanguage. New grammar file: file:///c%3A/Users/jj%20haenlein/.cursor/extensions/twxs.cmake-0.0.17/syntaxes/CMake.tmLanguage register @ textMateTokenizationWorker.workerMain.js:31 textMateTokenizationWorker.workerMain.js:31 Overwriting grammar scope name to file mapping for scope source.cmakecache. Old grammar file: file:///c%3A/Users/jj%20haenlein/.cursor/extensions/ms-vscode.cmake-tools-1.20.53/syntaxes/CMakeCache.tmLanguage. New grammar file: file:///c%3A/Users/jj%20haenlein/.cursor/extensions/twxs.cmake-0.0.17/syntaxes/CMakeCache.tmLanguage register @ textMateTokenizationWorker.workerMain.js:31 workbench.desktop.main.js:4808 Writing file file:///c%3A/Users/jj%20haenlein/.cursor/extensions/ms-vscode-remote.remote-wsl-0.81.8/dist/node/wslDaemon.js workbench.desktop.main.js:4808 Writing file file:///c%3A/Users/jj%20haenlein/.cursor/extensions/ms-vscode-remote.remote-wsl-0.81.8/dist/node/extension.js workbench.desktop.main.js:5014 Error refreshing background composers ConnectError: [unauthenticated] Error at t (workbench.desktop.main.js:2319:114067) at async Object.listBackgroundComposers (workbench.desktop.main.js:97:15148) at async Nki.refreshBackgroundComposers (workbench.desktop.main.js:5014:5837)

Please check this: [image] [0.47.5]The UI is very slow so that I can not work with it! Bug Reports I think this issue is related to a large amount of chat history in your project. You can try renaming your project and opening it. If that helps, then the cause is clear. If your chat history is important to you, you can try exporting it using this extension:

Looking for lag reduction methods

Support Help

deanrie (Dean Rie) March 27, 2025, 7:37am 4

Please check this:

Topic		Replies	Views
Exteme Lag in cursor mid project! Help! Help	15	3503	March 13, 2025
IMPORTANT: Cursor lag & unresponsiveness (AI works ok) Bug Reports	9	1562	July 10, 2025
Cursor very laggy Bug Reports	46	2901	September 22, 2025
Cursor lagging to the point of uselessness Bug Reports	4	751	March 23, 2025
Heavy lag while using Cursor Bug Reports	5	5070	February 17, 2025

Looking for lag reduction methods

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