Game and macOS UI slow while playing games in Big Sur

Hello,

Since updating to the macOS 11.0, Big Sur (11.1, 11.2 versions effected too). I have noticed that any game I play, whether it be World of Warcraft, Hearthstone, Diablo III, are all very slow. No matter what I change my resolution settings too, or how low I change the graphic settings, the games FPS will improve, but then, will go down randomly (60 FPS normally, then down to 27 for fighting something in Northern Stranglethorn).

Not just this, however, I notice the entire system UI slows down. I checked activity monitor, and memory pressure isn’t high, with 6 GB left of RAM, and CPU usage is normal. Anyone else have these issues on Big Sur? Any comment would be appreciate.

I would also like to note that on macOS Catalina, I did not have these issues whatsoever.