

As I… think has been mentioned elsewhere in this thread, you can run Gamescope + Proton + Wayland, and force the refresh rate.
You can do this with xrandr or sometimes some games actually expose it as a thing you can directly configure.
Presumably, you could set this to, for this example, 90, and probably help out the frame timing variance a bit.































Hows your hardware?
Memtest your RAM?
HDD or SSD? How old are they, they got any problems?
If you keep hitting problems on connecting to timezone, it might be your wifi chip / card, could be that its an odd duck that still has driver quirks on linux, + is maybe physically damaged… could lead to a lot of nonsense if you are actually grabbing malformed core files from a not fully offline install.