This game installs the Aspyr Linux native version by default which is very out of date, runs poorly, and had numerous issues. By running the game through Proton the Windows version is downloaded instead which looks and performs like an entirely different game. The only thing the Linux version does better is the lack of an uneccesary launcher and unskippable licensing credits. Use the -nolauncher and -nomoviestartup launch options to take care of those pesky problems.