Ubuntu
gnome-system-monitor package

  1. Bug #1773502
  2. Comment #11

Comment 11 for bug 1773502

Revision history for this message
Daniel van Vugt (vanvugt) wrote : Re: High CPU usage in gnome-shell & Xorg when using Firefox

Oooh... that makes sense now, thanks.

The problem you are seeing is with mutter/gnome-shell being inefficient at frequently-updating software rendered windows. This is a known problem, but until now we only knew of Eclipse triggering it (bug 1756508), and the older pre-Quantum versions of Firefox (bug 1696305).

What you are seeing is a known performance problem, but you have discovered a great test case for it in the Resources tab. So thanks.

As I suspected, this is not a problem with the new Firefox at all (which is hardware rendered). It's a problem with gnome-system-monitor, or any frequently-redrawing software rendered (e.g. Gnome) app.

I only have two more questions: What is your display resolution, and are you using Wayland or Xorg? Both of these can be answered by running 'xrandr' and sending us the output.