I tested all of these:
  * gnome-extensions disable tiling-assist...@ubuntu.com
  * gnome-extensions disable ubuntu-appindicat...@ubuntu.com
  * gnome-extensions disable d...@rastersoft.com
  * gnome-extensions disable ubuntu-d...@ubuntu.com

and then had no effect on the performance on noble (yes they did disable
and I could see the visible changed in UI). I tried rebooting afterwards
with no improvement.

I did this:
  You can test that theory by comparing the windowed performance between jammy 
and noble.

noble performance is about equal with a maximized window and fullscreen
(140fps)

jammy performance is a bit lower maximized window than fullscreen
(162fps vs 177fps) but I see gnome-shell cpu usage at ~50% when when
maximized window (vs 0-1% in fullscreen)

so yeah definitely appears to be an issue with fullscreen direct scanout
not working and additionally just gnome performance regresssions with
windowed mode .

-- 
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https://bugs.launchpad.net/bugs/2052913

Title:
  Large Performance Regression in gnome-shell from Ubuntu Jammy to
  Ubuntu Noble

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