When creating a new world and walking in a straight line the load of chunks slows down and begins to load slower, this did not happen from the 20w14infinite snapshot backwards, I have tried using both java 8 and java 11 and there is no difference.
Changed Settings:
Fov: Max
Limit FPS: Unlimited
Vsync: OFF
GUI: 2
Affected Versions:
All from 20w14a
How to reply:
Install a linux distribution (In my case based on debian), install java 8 - 11, run minecraft 20w14a, create a new world in creative, run in a straight line while you fly
Once this process is done you can see how the world slows down
Sorry for my bad english