So, I have an AMD FX 8000 something. It's an 8-core, relatively powerful, 8 GB of ram. When I began our world, it was running a solid frame limited 60 FPS. It got down to 10 FPS anywhere in the world, I added Optifine, and got back up to 30-40. Now, it's back down to 15. (This is all outside of our base and all). It's all also running on a dedicated server(with 2 players). What could cause the increasing loss? My friend I'm playing with, is crashing every hour or so, but runs at a higher framerate. (Not actually crashing, just catastrophically freezing). I don't crash but I do lag quite bad. I am running Ubuntu if that matters, but this is Java, so it shouldn't.
Does anyone else have this issue? Solutions?