Hmm, gnome-shell is mostly single threaded so it shouldn't be able to use "all cores". It should saturate only one core at most.
Please provide a screenshot of 'top' running in a Terminal window, showing that gnome-shell (or anything) is using the CPU. ** Tags added: eoan performance ** Also affects: mutter (Ubuntu) Importance: Undecided Status: New ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete ** Changed in: mutter (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs