MBP 16 inch with a i9 and 5500m. I cant do any cpu intensive things without getting 6 fps on my Mac, this never happened on Catalina and I am very annoyed and im probably going to buy a windows laptop if this isn't fixed.

yea, I think they fixed it but, I agree I spent $1400 on a razer core x and radeon 5700xt only to find it doesnt work on Big Sur ;-; but like I said I think they fixed it (my source is r/egpu, I asked there recently)