I've started a couple Attack of the B-Team worlds, and this has happened to every single one of them. But whenever I start a world it will work perfectly fine for a few days (or a few hours worth of game play). However, after a period of time, the world just randomly loses all fps, my rendering drops completely down to nothing, and I can barely move when I am anywhere near my home base (which is where i put and control all the mods and items I use), but whenever I teleport away from my base a couple chunks away (still within sight) everything works fine again. Anyone else having this problem? How do I fix it?