Similar issue, seems related to the graphical activities: Xorg is often on the top of the CPU usage, web content or Firefox too. I use a fresh install of 18.04.
** Attachment added: "CPU usage" https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1773244/+attachment/5144413/+files/Capture%20du%202018-05-25%2022-41-33.png -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1773244 Title: gnome-shell using high cpu Status in gnome-shell package in Ubuntu: Incomplete Bug description: Description: Ubuntu 18.04 LTS Release: 18.04 ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-shell 3.28.1-0ubuntu2 ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17 Uname: Linux 4.15.0-22-generic x86_64 ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 CurrentDesktop: GNOME Date: Thu May 24 22:16:07 2018 DisplayManager: gdm3 EcryptfsInUse: Yes InstallationDate: Installed on 2017-09-14 (252 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) SourcePackage: gnome-shell UpgradeStatus: Upgraded to bionic on 2018-05-01 (23 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1773244/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
