I've updated my issue, there is now a log from after the game slows down, and I quit the game normally after it has slowed down noticeably. The newer Nvidia 396.54 drivers do delay the onset of slowdown, but do not preve...
Re-tested with Ubuntu 18.04, with newer graphics driver. [Ubuntu 18.04 System Information ](https://gist.github.com/HonkingGoose/5b35f2af620286153a22e509f9b5e82a) Can't replicate my problem. I've included a new proton lo...