Some biomes do lagg others do not. If I#m in an orchhard it's perfectly fluent if I#m in a dead forest it does lagg and in a hotsprings biome I can't even walk normally becaus of the enormus lag. I don't now if it's fixed in but as many people are playing BOP in 1.5.2 because of the direwolf20 pack being ot that version you should fix this.

You honestly expect a mod that adds extensive amounts of generation to not be laggy if you don't have sufficient resources? This can be said about practically every mod, especially considering that this isn't one "specifc case" that globally causes lag specifically caused by doing something that can only be done with BOP on computers that actually have sufficient resources.