fps issues

I was playing on my own minecraft 1.13.1 server with around 150-250 fps, so everything was good. But since today Im playing the game with just 20-70 FPS for no reason. I alredy tried to reinstall the game, but this didnt help. And btw I have like 20-400 Chunk updates since I have this low fps.

My system:
Ryzen 5 1600
Rx 470
8gb ram