Hangs up for a long time after waking the machine and connecting external monitors about slate HOT 5 OPEN

OSX 10.14.4

----------------- Screens -----------------
Left To Right ID: 1
  OS X ID: 0
  Resolution: 2560x1440
Left To Right ID: 2
  OS X ID: 1
  Resolution: 1680x1050
Left To Right ID: 0
  OS X ID: 2
  Resolution: 2560x1440

from slate.

Also seeing this behavior. Works great for hours or even days after restarting, but then starts beachballing when I trigger a move. It eventually will 'catch up' but by then I've switched windows so it applies the move to the current window instead.

from slate.

I have also seen this behavior for quite some time. I used to blame it on the USB-C switcher (for external display), but it happens even when the laptop is running on its own

Are there logs/anything that we should try to grab to help debug?

from slate.

I just ran into the issue again. I unplugged my external display (Apple 27-inch Thunderbolt Display) and plugged it back in, and that seems to have solved the issue without me having to restart. So give that a try if you're using more than one monitor and having this issue.

from slate.

Hmm, the problem is back after ~15 minutes. So I guess unplugging the second display isn't really a fix.

from slate.