Public bug reported:

Even when doing nothing but displaying a terminal screen with top
running gnome-shell uses 10% of a CPU. That seems excessive. I disabled
all extensions to try and make the test fair. Enabling the system
monitor extension increases the load to 13-14%. It seems that the gnome-
shell screen painting is highly CPU consuming even if screen updates are
infrequent (1 a second for all these cases).

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.1-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue May 29 11:38:05 2018
DisplayManager: gdm3
InstallationDate: Installed on 2016-10-27 (578 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to bionic on 2018-05-19 (9 days ago)

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

** Tags: amd64 apport-bug bionic

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  High CPU usage by gnome-shell even when idle

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