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On my Mac, I have 3 different Input Sources and after some time from rebooting, I'm starting to experience input lag when switching between input sources.

Here is a video - I press my shortcut to change the input source (as I see on the menu bar - it's switching immediately) and then I start typing rapidly.

Usually, this bug appears a few days after I restart my computer. For example, this happened today - uptime is 2 days.

For switching language I'm using Karabiner + MLSwitcher. Karabiner just maps Caps Lock to Ctrl+Shift and MLSwicher catches this combo and cycles through my input sources.

I think this is not a problem with Karabiner or MLSwitcher, because the language in the bar menu switches immediately after pressing the caps lock.

The application in which I switch languages also freezes for a moment.

Here is the video: https://cln.sh/MSLcl0mq

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  • Sorry I don't have enough reputation to comment so I have to post this as an answer — but do you experience the same delay when you use the system switch input source combo Ctrl+Option+Space ("Select next source in input menu" in "Keyboard shortcuts -> Input sources")? Commented May 9, 2024 at 13:23
  • @hym3242 yes, the same delay. But can say after some time, because I've rebooted my Mac) Commented May 9, 2024 at 16:43
  • The problem was with CursorUIViewService - it's not responding in Monitor. Just kill it. Also I hope that this patch will help to prevent this bug - reddit.com/r/MacOS/comments/171vtvz/… Commented May 23, 2024 at 9:36
  • That's nice to know. Though it's not really a patch, it's really just a script that writes a plist for you. Commented May 26, 2024 at 2:16

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