I was in a new world i'd started (not advanced at all, I'd be fine restarting it), when, after logging in for about maybe the third time, I noticed I was getting extreme block lag, to the point I could break it, and if I waited 5 mins, nothing would happen (I.E no drops). I tried relogging to solve the problem several times, until eventually trying turning the modpack on/off. At this point, any time I try and load the Modpack, This crash happens. Can anyone help?