Hello @DoomedSouls, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/4593#issuecomment-1043021878.
I fixed this issue with launch option "mangohud %command%" and adding this line "vsync=2" to MangoHud.conf.
Compatibility Report
System Information
I confirm:
Symptoms
Selecting 120 fps will not change the frame rate and game speed is half. Selecting afterwards 30 fps will also no change frame rate. Its stuck at 60 fps with incorrect gamespeed.
steam-1325200.log