I'm having severe problems with the pack, almost every time it's autosaving the game starts lagging like crazy, dropping from a fixed 60 to 2-15 FPS, sometimes 15-30, it's very inconsistent and kinda random.
Running newest Java7
i5 3770k @4,6 GHz
16 GB Ram @1866 Mhz /4GB dedicated to FTB
GTX...