I have an EMC link setup to my ME system with some resources in it so it can show up on the ME system. So if I try to autocraft something, for example 4 molecular assemblers, the game lags and I can't use anything or place blocks and I have to restart minecraft. I found the problem is that the EMC link is for some reason causing this huge lag/freezing because if I get rid of the cable connecting the EMC link to the system then there is no lag when going to craft the same items. Not sure if there is a fix for this.