1.16.100's massive lag version

I just updated and installed minecraft's new offcial version excited to see new feature and fixes,they say they fixed a lot of bugs.yeah they did.but,i have even worse experince on this version 1.16.40 was amazing i was having 60 fps constantly but now i am have 20 and lower fps 

Please fix this problem MOJANG

🙏🙏🙏