20w 22a lagging

Put the summary of the bug you're having here

What I expected to happen was...:
the game run normal (50-60fps minimum)

What actually happened was...:
the game did not run normal (2fps maximum)

Steps to Reproduce:
1. i open the game, normal
2. i open the world, bruh lag
3. i reset the game, change worlds, change video options only to result the same

4.i open the same maps in 20w21a and they run normal again

conclusion: 20w22a is lagging pls help