Was chasing down some odd graphics card behavior in Steam, ultimately traced to a corrupted config in Steam (my fault, swapping out too many different Proton-GE’s). Anyway, along the way, I finally got around to reading the documentation on gamemode. I only installed it because I needed it for Lutris but, as it turns out, it’s an instant graphics card upgrade. To illustrate, I have Borderlands 3 installed. This comes with a bench marking test. On “Ultra” settings, I was getting just under 63 FPS. With gamemode enabled, that jumped to a little over 77 FPS (almost 15 FPS gain). Updating my Borderlands 3 settings to maximum (“Badass”), I was still getting over 70 FPS. This is with the default gamemode settings. In Steam, all I had to do was add “gamemoderun %command%” to the launch options (no quotes).
…If you haven’t played around with gamemode…you want this.