Since you also have a 12th gen Intel processor, I just tried pinning the game to only the P-cores of my processor (0-15) and that didn't seem to help.
I'm also playing the game on minimum settings.
I have this exact same issue running Vulkan on Linux via Proton. I also have a 12th gen Intel CPU, but I have an AMD GPU (6700xt).
Someone in a game said that disabling the Discord overlay fixed it for them, but I'm not running any such overlays.
