Ok, so the game map is very large, and currently it loads the entire map in at once before it starts to occlude non-visible stuff, at this point it's just the reality. However, I developed a new system that loads the map in chunks based on where the player is. Hopefully this allows a wider range of hardware setups to get it running well. We're still a few months out before our next big update, but if you drop a message in the discord, I'll shoot you a build with the updated mechanics when we start player testing! Otherwise, I can ping you when we release the new build.