Public bug reported:

I am experiencing 60% - 200% CPU utilization after an upgrade from
ubuntu artful to bionic.

Pretty much any drawing results in a sluggish behavior due to high CPU

The same combination of kernel/drivers did not result in the issue on
17.10 so gnome-shell seems a good candidate to blame.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.0-0ubuntu5
Uname: Linux 4.16.0-041600-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Apr 15 16:53:34 2018
DisplayManager: gdm3
InstallationDate: Installed on 2017-02-27 (412 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Alpha amd64 (20170227)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to bionic on 2018-04-15 (0 days ago)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic third-party-packages

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  [bionic][beta][nvidia] gnome-shell high cpu utilization

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