So I don't know how useful it would be to speedrunning as a whole and I'm not entirely sure what it is that's causing it, but fog doesn't seem to affect my game at all. I assumed it was because of hardware because I've never played modded trying to test stuff. I'll try to supply some images and/or video for it later in a vanilla game. Regardless I don't entirely know if it is even useful for speedrunning but I wanted to bring it up just in case. It'd be interesting to at least figure out a vanilla way to basically nullify fog.