Hello @GermanAizek, 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/7764#issuecomment-2245978476.
proton experimentalx1 2024-07MESA_VK_DEVICE_SELECT=listx1 2024-07
Compatibility Report
System Information
Video driver version:

Kernel version: 6.9.10-amd64
Link to full system information report as 4 Gist proton logs with different aliasing modes:
Proton version: latest Proton Experimental
I confirm:
Symptoms
Low fps if you use default settings when starting game on Linux Desktop or Steam Deck, with MSAA x8 fps in range 10-15, with smoothing x4 15-20, with smoothing x2 20-25. This is very uncomfortable, but it is enough to disable anti-aliasing in configuration tool and it will be more than 90 fps on my configuration.