Here are the env variables for those in Steam:
PROTON_NO_ESYNC=0
PROTON_NO_FSYNC=0
In case for those 0 means it’s enabled, 1 disabled…You should try on or the other, not both simultaneously though.
Example of how to use Proton env variable in Steam
If you don’t have any major errors in journalctl -p3 -xb related to Kernel / GPU - you should be fine, also let’s see your inxi -Gxxxzy1
More and more it looks like a specific game / Proton problem to me, especially given comments there…although we’re not done yet…Since i haven’t played it:
-
What’s directx in that game? If it’s 12 - choose 11, in most games it’s still much better perofrmance with
dxvk -
Since your GPU is not top end, try to disabling all usual suspects stuff from graphics settings like:
- Motion blur
- AA (just to check, although something like FXAA would have almost 0 impact on performance)
- Vsync (just to check)