Another issue the game will not close gracefully even with 5.13-2 (also the same with 5.13-1 and 5.0-10) When you confirm the exit in game the game freezes and has to be killed with the "Stop" button the Steam's library ...
The frame rate stutter may be fixed with Proton 5.13-2 and having vsync disabled. It has at least been mitigated, I just played for and hour and didn't have an issue. Previously I had to restart every half hour or risk g...