Can confirm this is an issue in ubuntu 18.04. Also affects Ubuntu Budgie
(reported it here: https://bugs.launchpad.net/ubuntubudgie/+bug/1767264)
which uses the same window manager as gnome shell (mutter).
Animations/window dragging are locked to 60fps regardless of actual
monitor refresh rate while everything else (glxgears, etc.) works as
expected. This issue doesn't exist in gnome 3.28.1 in other Linux
distributions so is likely the result of some Ubuntu 18.04 specific
patches.
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1767693
Title:
18.04 GNOME displays at 60fps even if the monitor is set to 144hz
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