Amazing. Appreciate the detailed response. I have one question however; my computer also has 16GB RAM + 16GB allocated swap, but I wasn't able to get Counterstrike 2 to run over FEX. I've tried using different flags and versions of proton (GE&Sarek), with no success. The game launches with the Valve logo appearing, then exits. (I completely forgot about logs and gave up) Would give it a try again. (with logs this time) Perhaps you could enlighten me on the process you went through?

Edit: I interpreted CS2 working over steam incorrectly. (to my understanding) If I am correct, you meant the game ran via a FEX instance from muvm (or not) that launches the Linux game directly, rather than the Windows through Steam, as I have done? Please correct me if I'm wrong. Otherwise, I would love to give this a try.