Game Stuck At 2 Fps

I wanted to test new version of the game. Menu were so smooth, its like it got optimized. Then I created a new save file, it was REALLY FAST, it was WAY faster than before, but when I entered the world... It stuck at 2 fps. Normally I can get 60 fps stabile on 1.16.4. I checked my pc, and cpu, ram and gpu usage looks like normal, they work like normal. I do not know whats the problem.