High CPU when just moving the mouse

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I've been working on a number of issues causing this. It is much improved in Ubuntu 19.10 but not yet quite at the point of being declared fixed.

Tracking in: https://gitlab.gnome.org/GNOME/mutter/issues/283

Your mouse is very fast (1000Hz) so you will notice the problem 8x more than most people (most mice are 125Hz).

http://x7.a4tech.com/product.aspx?id=68

Is there anything I can do by my side to at least lower the cpu usage or no?

In theory you might be able to avoid around 87% of the problem by changing your mouse polling rate from 1000Hz to 125Hz. To do that you need to add a kernel parameter:

  usbhid.mousepoll=8

or similar... https://wiki.archlinux.org/index.php/Mouse_polling_rate

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...

This bug was fixed in the package mutter - 3.36.0-2ubuntu1

---------------
mutter (3.36.0-2ubuntu1) focal; urgency=medium

  * Merge with debian. Remaining changes:
    + debian/control:
      - Update VCS flags to point to ubuntu salsa branch
    + debian/gbp.conf: update branch to point to ubuntu/master
    + debian/patches/x11-Add-support-for-fractional-scaling-using-Randr.patch:
      - X11: Add support for fractional scaling using Randr
  * d/p/clutter-master-clock-default-Sync-timelines-to-hardware-v.patch:
    - Improves smoothness and reduce input-to-output latency
      levels (LP: #1862308)
  * debian/libmutter-6-0.symbols:
    - Update as per background mipmap levels patch symbol addition
  * Ubuntu bugs resolved since 3.35.91-1ubuntu1:
    - Higher than necessary CPU usage on mouse movement (LP: #1848951)
    - No mouse cursor drawn for radeon in Wayland sessions (LP: #1867080)
    - Restarting displays apps running on other workspaces (LP: #1819890)
    - Volume/brightness OSD make fullscreen video flicker (LP: #1828697)

mutter (3.36.0-2) experimental; urgency=medium

  * control: Build against gnome-desktop 3.36 and break old gnome-shell. So we
    get dependencies on libgnome-desktop-3-19. Otherwise we get two different
    versions of gnome-desktop loaded into GNOME Shell, which crashes. Break
    old gnome-shell for the inverse reason - it needs to be upgraded otherwise
    we get the mismatch the other way around.

mutter (3.36.0-1) experimental; urgency=medium

  * New upstream release
    + Fix placement of popup windows in multi-monitor setups
    + Fix invisible mouse cursor on some hardware
    + Updated translations

mutter (3.35.92-1) experimental; urgency=medium

  * New upstream release
    + Add side channel for starting required X11 services
    + Allow remote desktop services to inhibit animations
    + Avoid flicker when (un)redirecting windows
    + Fix clipping glitches in long text entries
    + Fix visibility of initially hidden windows
    + Implement scaled/transformed hardware cursors
    + Let BindConstraints update the preferred size
    + Make check-alive timeouts configurable
    + Make each stage view correspond to a single CRTC
    + Make Xwayland startup asynchronous
    + Ping windows on every window focus
    + Remove overhead from hot code paths
    + Support synchronized wayland popup moving
    + Update screen-cast code to PipeWire 0.3 API
    + Use DMA buffers for screencasting if possible
  * d/p/*: Rebase
  * rules: Disable remote-desktop temporarily. This now requires pipewire 0.3
    which is not packaged yet and needs to be worked on
  * control: Bump wayland-protocols dep to 1.19 per meson.build
  * debian/libmutter-6-0.symbols: Add new symbols for this release. One symbol
    which was introduced in .90 was dropped; -6's ABI is not stable yet.

 -- Marco Trevisan (Treviño) <email address hidden> Thu, 19 Mar 2020 15:51:05 +0000

Last I checked Xorg was still affected by this problem.

still affects GNOME Shell 3.36.3

Jegor,

This bug is closed for Gnome Shell. Please open a new bug by running this command from the affected machine:

  ubuntu-bug gnome-shell