Public bug reported:

I have ubuntu 10.10 with Xorg Gnome desktop, intel i915 driver and two monitors 
attached.
gnome-shell causes a very high CPU load which seems to make the system unusable 
sluggish.
When moving a window the CPU usage of gnome-shell raises to over 90 %.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-shell 3.26.2-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.13.0-37.42-generic 4.13.13
Uname: Linux 4.13.0-37-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Mar 16 21:30:31 2018
DisplayManager: gdm3
GsettingsChanges:
 b'org.gnome.shell' b'favorite-apps' b"['org.gnome.Nautilus.desktop', 
'firefox.desktop', 'libreoffice-writer.desktop', 'libreoffice-calc.desktop', 
'libreoffice-impress.desktop', 'org.gnome.Software.desktop', 
'gnome-control-center.desktop', 'thunderbird.desktop', 'jameica_2_6_6.desktop', 
'org.gnome.Calculator.desktop']"
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
InstallationDate: Installed on 2017-08-18 (210 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to artful on 2017-11-05 (131 days ago)

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


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1756439

Title:
  gnome-shell causes high CPU load with dual monitors

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