Occurs after a few seconds with this setting: 
- Kernel 5.3.10-050310-generic
- swap available
- moving a 10 GB partition with gparted (high disk load on a USB attached SSD)
- xserver-xorg-video-intel installed

disabling swap solved the problem.

also the mouse hangs when window animations are active.

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https://bugs.launchpad.net/bugs/1852001

Title:
  Xorg freeze on high disk or cpu load or random

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