I'm now looking at a profile of gnome-shell running normally, next to a
profile of the same but with the activities overview open. I can now see
at least two causes of the higher CPU (and higher GPU load?) when the
overview is open.

** Changed in: gnome-shell (Ubuntu)
     Assignee: (unassigned) => Daniel van Vugt (vanvugt)

** Changed in: mutter (Ubuntu)
     Assignee: (unassigned) => Daniel van Vugt (vanvugt)

** Summary changed:

- App Drawer Animation Causes Heavy CPU Spikes in Wayland & XOrg
+ Activities overview causes heavy CPU spikes in Wayland & XOrg

** Changed in: gnome-shell (Ubuntu)
       Status: Confirmed => In Progress

** Changed in: mutter (Ubuntu)
       Status: Confirmed => In Progress

** Summary changed:

- Activities overview causes heavy CPU spikes in Wayland & XOrg
+ Activities overview causes heavy CPU spikes in Wayland & Xorg

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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/1750197

Title:
  Activities overview causes heavy CPU spikes in Wayland & Xorg

Status in gnome-shell package in Ubuntu:
  In Progress
Status in mutter package in Ubuntu:
  In Progress

Bug description:
  Ubuntu Release: 17.10 and 18.04
  gnome-shell version: 3.26.2
  System Theme: CommuniTheme Beta

  Upon navigating through various areas of the system, GUI animations
  are very stuttery. This heavily affects the CPU usage of my device.
  For instance, opening the shell app drawer displays a very janky
  animation, and my CPU will spike to nearly 85% for each open/close.
  This happens regardless of using XOrg or Wayland; however Wayland
  appears to have an overall lower impact on resource usage. The CPU in
  this laptop isn't the greatest (being a 2014 Celeron), but this is
  noticeably more sluggish compared to previous releases like 16.04 and
  16.10.

  This same issue is still existent, but somewhat less noticeable on my
  other i5-6400 (GTX 1050) machine. Also, emulating this release in a VM
  with 2 CPUS and 4096MB of RAM renders it unresponsive for 3-5 seconds
  after opening/closing the app drawer.

  Please do not hesitate to follow up with requests for more info, as I
  will be happy to help.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: gnome-shell 3.26.2-0ubuntu0.1
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: ubuntu-communitheme:ubuntu:GNOME
  Date: Sat Feb 17 19:13:00 2018
  DisplayManager: gdm3
  ExecutablePath: /usr/bin/gnome-shell
  InstallationDate: Installed on 2018-02-17 (0 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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