Chromium pauses and is randomly unresponsive with two windows
If you open Chromium with two windows (Ctrl+N) and put each on a different workspace, then one of them at least is randomly unresponsive and takes too long to repaint. Even simple things like navigating the app menu.
I'm not sure if this is a mutter bug, Xwayland bug, or even a Chromium bug. But it doesn't happen in Xorg sessions, only Wayland with Xwayland.
Verified in gnome-shell 3.38.1-1ubuntu2, libmutter-7-0 3.38.1-2ubuntu1.
Downstream Ubuntu bug: https://bugs.launchpad.net/bugs/1906792
Edited by Daniel van Vugt