GooberGo

I was playing this modpack yesterday, and all of a sudden I started to lag. It kept getting worse and worse, to the point where i'd be at 5 frames.. and this is unusual, because I would always get a solid 100-200 fps. And yes, I've tried increasing ram, check if java was the right version and etc. But what I did was teleport myself to a random location in my world, and all of a sudden frames are back to good. But when I teleported back to my house, lag started to begin, AGAIN. So I'm starting to think it's a chunk problem, or either a biome that's causing my game to lag. Anyone have suggestions to fix this? Thanks.