Hello Am i the only one who observed very bad performance since updating to today’s update on windows 10 ? I can’t seem to work in correct conditions due to strong IDE lags, i’m thinking of temporarily switching to sublime the time it’s solved (yes it’s that bad). I wonder if i’m the only one having this issue? Best

After updating to 2.6.11, I noticed right away that the program was running awfully slow, after a couple of prompts and basic operations RAM usage skyrocketed to 5GB+ (and climbing lol) with CPU usage hovering around 20-30% which points to some sort of memory leak. Killing the process via task manager and a fresh restart to the welcome window “fixes the issue”, HOWEVER reopening the workspace (that has git history and a couple of active chats with agents) starts leaking memory again, the leak is so severe I can barely get to the built in process explorer without cursor crashing. Version: 2.6.11 (user setup) VSCode Version: 1.105.1 Commit: 8c95649f251a168cc4bb34c89531fae7db4bd990 Date: 2026-03-03T18:57:48.001Z Build Type: Stable Release Track: Default Electron: 39.6.0 Chromium: 142.0.7444.265 Node.js: 22.22.0 V8: 14.2.231.22-electron.0 OS: Windows_NT x64 10.0.19045 FOLLOW-UP: The culprit seems to be an agent mode chat with Opus 4.6 (thinking), selecting that tab (or booting Cursor with that tab selected) immediately inflates the RAM usage and starts leaking heavily. Switching to a different agent tab, closing the entire program and re-starting with the non-problematic agent tab fixes the issue. [cursor memory leak] Note: some of the information above is copy and pasted verbatim from here because it flew under the radar: https://forum.cursor.com/t/renderer-oom-crash-code-536870904-every-3-minutes-on-windows-128gb-ram-reproducible/152534/22

[{ABB36EEA-B3AF-44E4-BF9E-579523CE184E}] I’ve been using Cursor for a month straight. I’ve never seen this happen. I think they should rollback this update - there is something wrong.

Same here. I noticed it’s related to the chat toolbar. If I hide it (CTRL+ALT+B on Windows), everything becomes usable again, but it freezes as soon as I show it. I also noticed it depends on the specific chat that’s open. I couldn’t find a clear pattern—sometimes a short chat history freezes, and sometimes a long one doesn’t. But the same chat session will always either freeze or not freeze consistently.

Update: it seems strong lags are being emitted from my chats conversation panels. That’s perhaps causing 60% of the slowdowns for me. Closing the conversations make things a bit more tolerable. I also noted that cursor do NOT like when we are dragging files around, that make cursor severely lag (ex dragging a file from outliner to the chats, it froze to death multiple time this week..) [image] Colin: Thanks for the reports. Can you please include your system info, either from Help > About or Cursor > About Cursor depending on your OS? Sure ``` Version: 2.6.11 (user setup) VSCode Version: 1.105.1 Commit: 8c95649f251a168cc4bb34c89531fae7db4bd990 Date: 2026-03-03T18:57:48.001Z Build Type: Stable Release Track: Default Electron: 39.6.0 Chromium: 142.0.7444.265 Node.js: 22.22.0 V8: 14.2.231.22-electron.0 OS: Windows_NT x64 10.0.19045 ``` i’m always up to date, and this month performance have been noticeable worse. I hope some of us will get some credits gifts for all that time waiting for our IDE to respond :upside_down_face: [{ABB36EEA-B3AF-44E4-BF9E-579523CE184E}] I’ve been using Cursor for a month straight. I’ve never seen this happen. I think they should rollback this update - there is something wrong. had the same. I thought it was the agent not patching properly and wasting all my credits away. Please tell me it’s not that :grimacing:

Version: 2.6.11 (user setup) VSCode Version: 1.105.1 Commit: 8c95649f251a168cc4bb34c89531fae7db4bd990 Date: 2026-03-03T18:57:48.001Z Build Type: Stable Release Track: Default Electron: 39.6.0 Chromium: 142.0.7444.265 Node.js: 22.22.0 V8: 14.2.231.22-electron.0 OS: Windows_NT x64 10.0.26200 —– I’m experiencing a similar issue. After the update, the Cursor IDE has become extremely slow and the memory usage has increased significantly. Not only when using the agent, but even during normal coding the editor becomes laggy, and sometimes scrolling is almost impossible. Restarting the Cursor IDE does not resolve the issue; the same problem persists.

Hey, thanks for the report. It looks like this might be a regression in 2.6.11. Today we’re seeing similar messages from other users too. The agent is showing full file rewrites in chat code blocks instead of minimal diffs, especially on larger files. A couple questions to narrow it down: Which model are you using? (Claude, GPT, etc.) Does this happen with small files too, or only with a ~2,300-line file? I’ve passed this to the team. Let me know if you notice any pattern tied to specific file types or sizes.

Where does the bug appear (feature/product)? Cursor IDE Describe the Bug I’m experiencing an issue where the AI code suggestions are overwriting the entire file rather than applying specific fixes. Every time a change is suggested, the tool deletes all existing code and replaces it with a new block, leading to massive line deletions and additions (e.g., +490 -490) even for minor edits. Steps to Reproduce Use Sonnet 4.6 planning executed Expected Behavior It should be possible to review specific logic changes. Screenshots / Screen Recordings [ERROR_2] Operating System Windows 10/11 Version Information Version: 2.6.11 (user setup) VSCode Version: 1.105.1 Commit: 8c95649f251a168cc4bb34c89531fae7db4bd990 Date: 2026-03-03T18:57:48.001Z Build Type: Stable Release Track: Default Electron: 39.6.0 Chromium: 142.0.7444.265 Node.js: 22.22.0 V8: 14.2.231.22-electron.0 OS: Windows_NT x64 10.0.22000 For AI issues: which model did you use? Sonnet 4.6 Does this stop you from using Cursor Sometimes - I can sometimes use Cursor

Is it only Sonnet 4.6? What about different files or different file types?

I am having the same issue. I was using codex 5.3? I think. [Screenshot 2026-03-04 212336] [Screenshot 2026-03-04 204940] cursor becomes unusable, doesnt respond for several minutes, high CPU and RAM usage

Laggy agent chat

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Viktor_Ilkun (Виктор Илькун) March 5, 2026, 12:52am 11

and creating new chat didn’t help, 796f6404-df24-4781-b439-1c286b05697a , the same full-file changes instead of small in agent-chat code-blocks

Topic		Replies	Views
Full file agent diff edit / laggy after Bug Reports review , performance , openai	0	91	March 5, 2026
Agent rewrites entire file every time Bug Reports review , composer	1	127	March 5, 2026
Cursor v1.5 - Release Discussions Release Discussions	263	20341	September 9, 2025
Cursor Agent Diff/Change Links Unresponsive Bug Reports chat , review	19	607	October 2, 2026
After update its stuck at generating Bug Reports	3	213	June 7, 2025

Laggy agent chat

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