Having massive lag issues with the latest version of the pack; I enabled the IC2 and red/blue power mods, but otherwise its vanilla. I have a high-end machine which runs other complex packs cleanly (minus worldgen lag which I'm used to). I get lots of other console spam. Opening a crafting table of any kind (TiCo, Vanilla, etc) results in a 10 second or so delay every time. Console reports InventoryTweaks took a bajillion nanoseconds to sort. I get lots of block lag, e.g., breaking blocks frequently results in a 5+ second wait before I pick up the block (playing SSP, not server). I see a lot of console errors go by...Mekansim couldn't parse the blacklist. Minetweaker couldn't build custom recipe 'cause something wasn't found. Pack is just painfully slow, like playing SMP over a 1200 baud modem.