For lunar, please try MUTTER_DEBUG_TRIPLE_BUFFERING=never although I
don't expect that's the issue. Assuming that's not the issue, please
also try MUTTER_DEBUG=kms and then monitor the posting method with:

  journalctl -f /usr/bin/gnome-shell | grep Posting

or collect it afterwards:

  journalctl -b0 /usr/bin/gnome-shell | grep Posting > journal.txt

and attach the results here.

Separately, another setting to try is: CLUTTER_PAINT=disable-dynamic-
max-render-time


** Changed in: mutter (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2016990

Title:
  [Lunar] Irregular FPS with Path of Exile

Status in mutter package in Ubuntu:
  Incomplete

Bug description:
  I'm having a strange issue with the game Path of Exile (free). With Ubuntu 
Wayland session, vsync on, I get very irregular frame rates, it jumps around 40 
fps.
  If I switch to Plasma Wayland the game is very smooth 60 fps.

  I'm running the game from Steam with Proton. I've tried Proton Experimental 
and Proton 8.0 so far, no difference.
  The game uses Vulkan so I guess it's being allowed to set up all the swap and 
presentation stuff pretty much itself... ?

  MUTTER_DEBUG_DISABLE_TRIPLE_BUFFERING=1 doesn't help Mutter so it's
  not strictly related to triple buffering, which makes sense since it's
  a full screen game anyway.

  Kernel: 6.2.0-1003-lowlatency
  GPU: Radeon 6800 XT
  CPU: Ryzen 9 5900X

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