Shell animations are not smooth

Status changed to 'Confirmed' because the bug affects multiple users.

It sounds like you're referring to gnome-shell and not Xwayland.

Status changed to 'Confirmed' because the bug affects multiple users.

There is a variety of reasons for this. I have tried to start listing (and fixing) them here:

https://trello.com/c/Q6JYXPPs

However please note that a resolution for the original reporter will result in this bug being closed. If you feel your issues are in any way different then please open a new bug of your own using the command: ubuntu-bug mutter

I think this should be resolved with https://gitlab.gnome.org/GNOME/gnome-shell/issues/1271

But I won't make it a definite bug link. This bug is a little too vague right now...

Hiruna, can you please provide a video or screenshot indicating which animations are not smooth?

We really shouldn't cover multiple issues in one bug, but I will accept it if we can clarify and narrow the scope of this bug.

Status changed to 'Confirmed' because the bug affects multiple users.

Since I've got a number of fixes coming in this area already and they are quite nearby to each other in the GUI we can treat it as a single issue. I've now listed the required fixes at the top of this bug.

^^^
That's only the window spread performance fix that has landed (to be released in 3.35.91). Not everything yet.

^^^
That's fixed in gjs 1.63.91

Fixed in (you need both):

gjs 1.63.91+
gnome-shell 3.35.92+

Don't panic, those are just tags. The full set of fixes detailed in comment #12 ARE expected to be released in Ubuntu 20.04.

This bug was fixed in the package gnome-shell - 3.36.0-2ubuntu1

---------------
gnome-shell (3.36.0-2ubuntu1) focal; urgency=medium

  * Merge with Debian. Ubuntu bugs resolved since 3.35.91-1ubuntu2:
    - gnome-shell crashed when enable-animations was false (LP: #1866044)
    - Overview animations were not reliably smooth (LP: #1725180)
    - Higher than necessary CPU usage on mouse movement (LP: #1848951)
    - Extension's preferences did not load (LP: #1866146)
  * debian/control:
    - Breaks yaru (<< 20.04.3~)
    - Breaks gnome-session (<< 3.35.3-1ubuntu4~) as per gdm yaru gresources
    - Breaks gnome-shell-extension-ubuntu-dock (<< 67ubuntu20.04.3)
    - Update Vcs-* to point to salsa ubuntu branches
  * ubuntu.json: Use Yaru gresource file for theming in ubuntu mode
  * debian/patches: Refresh
  * d/p/overview-Fade-in-out-over-the-desktop-instead-of-replacin.patch:
    - Fade in/out the desktop instead of replacing it (LP: #1847712)
  * d/p/ubuntu/gdm_alternatives.patch:
    - Set the default theme resource for gdm session to 'gdm3-theme.gresource'
    - Alias the default gnome-shell.css to gdm3.css
  * gnome-shell-common.install: Don't install compiled css file anymore
  * gnome-shell-common.{preinst,prerm}:
    - Remove obsolete alternative gdm3.css symlink
  * gnome-shell-common.postinst:
    - Set gnome-shell-theme.gresource as alternative for gdm3-theme.gresource
  * Remaining changes from debian:
    + Replace gnome-backgrounds dep with ubuntu-wallpapers and Suggests
      gnome-themes-standard-data, gnome-backgrounds
    + Add some Recommends:
      - ubuntu-session (| gnome-session) to have the ubuntu session available
      - xserver-xorg-legacy
      - yaru-theme-gnome-shell for the default ubuntu theming
    + Update debian/gbp.conf with Ubuntu settings
    + gnome-shell-common.prerm: Remove deprecated ubuntu theme alternative
    + ubuntu/desktop_detect.patch:
      - add caching for desktop detection to avoid querying the current
        desktop env variable as iterate through the list each time. For the
        time of the Shell process, we can expect this env variable to stay
        stable.
    + ubuntu/smarter_alt_tab.patch:
      - quick alt-tab (without showing up the switcher) switch only between
        the last window of the last 2 applications to be focused instead of
        raising all windows of those apps.
    + ubuntu/lightdm-user-switching.patch:
      - Allow user switching when using LightDM.
    + ubuntu/lock_on_suspend.patch
      - Respect Ubuntu's lock-on-suspend setting.
    + ubuntu/background_login.patch
      - Change default background color as we modified the default GDM color
        for our ubuntu session.
    + ubuntu/gdm_alternatives.patch
      - Add support for GDM3 theme alternatives
    + optional-hot-corner.patch
      - enable patch proposed by upstream developer already in package (but
        not in series) to add a settings for optional hot corner activation.
    + main-show-an-error-message-on-gnome-shell-crash.patch,
      global-make-possible-to-set-debug-flags-dynamically.patch,
      main-increase-the-granularity-of-backtraces-in-SHELL_DEBU.patch,
      main-add-backtrace-c...

gjs (1.63.92-1) experimental; urgency=medium

  * New upstream release
  * tests-Avoid-filename-conflict-when-tests-run-in-parallel.patch: Drop,
    upstream

 -- Iain Lane <email address hidden> Tue, 03 Mar 2020 09:18:17 +0000