I'm thinking bug 784055 is a large part of the problem here. And I am guessing that if you follow the instructions in comment #2 then you might have experienced bug 1880405 which still randomly affects Ubuntu 20.04.
If no further information is added here then this bug will close automatically after 60 days. But please also uninstall indicator- multiload while testing for additional CPU hogs. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1928791 Title: gnome-shell runs on 60--100% CPU usage To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1928791/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs