I don't understand why the plain terrain is rarer than before, instead the jungle terrain and the taiga terrain appear a lot of trees covered everywhere the plain can't be found .

The next error is an error that reduces game performance, I don't understand why the number of frames per second fluctuates from 30 to 58 but for some reason my world loads very slowly despite lowering the graphics level, But blocks load very slow 30 seconds only load a small area making me unable to play normally. 

Please optimize the game for a better experience