So, I was just playing single player survival on a modified DW20 pack. It was running about as well as expected, (generally 30-50 fps with an occasional 60fps+) when out of nowhere the fps cratered to an average of about 2-3. The worlds only a few hours old, and the most complicated machine in it is a tinkers smelter with no lava or metals in it. It looks like some "unspecified entities" are taking up a huge amount of resources, but I don't have a lot of experience with the Shift+F3 graph so I took some screenshots so I could get some advice: