Im seeing this here. The last week on and off seems to be unusable. Plans and Agent builds taking 20 minutes for simple tasks. making it useless unfortunately. My Network diagnostic logs.
So i have been experiencing a slow UI experience since the start of the month too, e.g. when typing, deleting, selecting a new cursor position, a delay in UI feedback really.
Starting with `cursor --disable-extensions` doesn’t help, however when opening the process explorer its snappy again lol? E.g. deleting characters.
looks like switching to a new version does not solve this issue… it is like slow to hell too in my using version 2.6.20 bluh after editing and opening a bunch of files
I am literally asking it to open a simple adata file and read off the dimensions and it can’t do it. It also spent $20 in the past two days just trying to do this. This is unusable and unacceptable.
Hey, thanks for posting in the thread. About the latest reports:
@ricky_b, the “snappy when Process Explorer is open” symptom is interesting. This is often related to background throttling of Electron processes. To dig in, can you share:
A screenshot of Process Explorer Cmd+Shift+P > Developer: Open Process Explorer when it’s lagging. Which process is using CPU
Whether GPU acceleration is enabled: Cmd+Shift+P > Preferences: Configure Runtime Arguments, check if disable-hardware-acceleration is set
Does the lag happen right after startup, or does it show up after N minutes of work or after opening Y files
Are you using external monitors, or any display scaling
If you can, a short screen recording of the lag 5 to 10 seconds would really help.
@taliefirzen, “slow after opening a bunch of files” sounds like memory pressure or an extension memory leak. Run cursor --disable-extensions from Terminal, open the same set of files, and see if it still happens. If things are fine with extensions off, it’s likely one of them. Cmd+Shift+P > Developer: Show Running Extensions will show what’s using resources. Also share your macOS version and how much RAM your machine has.
@lsc04361, getting stuck on grep could be a known case with multi-root workspaces. Can you confirm:
Do you have a single folder open, or a multi-root workspace with multiple folders added via File > Add Folder to Workspace
Repo size roughly, files count or GB
Cursor version Help > About Cursor > Copy
If you have a Request ID for the stuck grep request, please share it chat menu top right > Copy Request ID
Since the thread has grown and the cases are different, if anyone has a stable repro, it’s easier to open a separate thread with specific symptoms and diag logs. We can move faster that way. Thanks for your patience.
Experiencing the same issue. Chat input is laggy and generally the whole app is very, very sluggish. Cursor’s responses are slow. On an M4 Max MacBook Pro, 128gb ram, Tahoe 26.3.1. Not snappy when Process Explorer is open. Restarting helps a bit but it quickly becomes sluggish again. Render seems to be the culprit.
Thanks for the info. This matches a known issue ERROR_EXTENSION_HOST_TIMEOUT that we’re currently investigating. The fact that it reproduces on both Windows 11 and Bazzite is an interesting signal and should help narrow it down. No ETA for a fix yet.
To dig deeper, try these in order:
Reload Window in the error window (button on the right in the popup, or Ctrl+Shift+P > Developer: Reload Window). Sometimes the extension host comes back.
Without extensions: run cursor --disable-extensions from a terminal and try the same prompt. If it works, the issue is likely caused by an extension (Jupyter, Remote-SSH, and MCP-related extensions are especially suspicious).
