Public bug reported:

When dragging a window between displays, I can see cpu usage increase
while framerate drops dramatically to single numbers.

Desktop scaling is 1.0, one is a WXGA screen and another FHD.

Ubuntu session (wayland), 17.10.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-shell 3.26.1-0ubuntu5
ProcVersionSignature: Ubuntu 4.13.0-16.19-lowlatency 4.13.4
Uname: Linux 4.13.0-16-lowlatency x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: Unity:Unity7:ubuntu
Date: Mon Nov  6 17:09:20 2017
DisplayManager: lightdm
GsettingsChanges:
 b'org.gnome.shell' b'favorite-apps' 
b"['/home/development/bin/firefox.desktop', 'org.gnome.Nautilus.desktop', 
'jetbrains-phpstorm.desktop', 'code.desktop', 'postman.desktop', 
'standard_notes.desktop']"
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
 b'org.gnome.desktop.interface' b'icon-theme' b"'ePapirus'"
 b'org.gnome.desktop.interface' b'gtk-theme' b"'DarkNumix'"
InstallationDate: Installed on 2016-03-13 (603 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160307)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to artful on 2017-10-19 (17 days ago)

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


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

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https://bugs.launchpad.net/bugs/1730460

Title:
  Framerate drops when moving windows across physical displays

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