I've played with Hexxit for a couple hours now. But when I startup it start lagging after 5 seconds. It hasn't done that before. My location is in a npc-village with a large battle tower going up next to it. When I log off and log back on it crashes.
Specs:
Inter Core i7-3770 3,4GHz
Ram 4Gb
Gtx 630 2Gb
Windows 8 64bit