Since this is a very large modpack, and I had to do a ton of tweaking to get it to not crash with 1 GB dedicated RAM, this modpack may lag on weaker computers. This is unlikely due to Optifine and FastCraft reducing lag by practically 100%, but in the off-chance that it does lag, here is an article on how to fix it: http://forums.technicpack.net/topic/147211-how-do-i-allocate-more-than-1-gb-of-ram-to-the-launcher/