Board Thread:Questions and Answers/@comment-173.175.73.76-20130607000213/@comment-71.114.134.211-20130608000004

the reason it's lagging is cuz quarries are like dimensinol anchors. in other words, you have chunks loaded all over the place. if you stop the chunkloading ability of quarries, it should kill the lag. other than that, the modpack should have a failsafe system to change IDs for conflicting numbers. I think NEI can change IDs, try tinkering around with the NEI options from the options button when you bring up the inventory.