Coal spill lag and general lag

For me the coal biome is super laggy like laggy to the point where it takes 5 seconds to do a 180 turn. I have a base halfway in the biome, and the half that's not in the biome it runs perfectly smooth(kinda) but right as I step foot into the base that's in the biome it's immediate lag. My friend that joins my game also just has extreme lag problems and tends to fall off our zipline hub and die quite often. I don't know how you would fix this but I guess if their was a graphic slider bar that could decrease the graphical requirements, that could help, or maybe having less of the map loaded while you aren't in it or something.