Using default proton ( proton hotfix ), I still encounter slow texture and models loads when spawning, but it is fixable using Proton-GE. Hardware anti-aliasing works without artefact now, but at the expense of performance I did not observed while running the game on Windows. Overall performance seems slightly worst compared to Windows experience, not a big deal considering smooth and stable performance are not achiveable on both OS at this state of the game developpement.