Out of box experience from Steam is tolerable and playable, frame stutter is a problem and inconsistent but still playable for most cases. I wanted to find a way to keep achievements and cloud save uploads enabled without having to switch back and forth from Native [using Steam Linux Runtime 1.0 (Scout)] to Proton to upload and sync every time. I tried another variant of Proton (GE-Proton9-27) and that didn't work, so I then forced Proton Experimental (as of 6/8/2025) and it actually seems to have fixed it. Frame pacing seems to be on par with Native Linux version and appears buttery smooth. Just for reference so it's easier to identify what Proton version would be useful in case future versions of Proton Experimental break fix, the current latest Proton version to available to force is 10.0-1 (beta). Hopefully this helps anyone trying to play in the future!