i recently upgraded my friends 2008 17inch MBP to ML from leopard. well i installed Lion over Leopard then ML, but it runs very sluggishly. He only has 2GB of ram installed, so i am wondering if he upgraded to 6GB if that would speed up his system. i have a 2011 13inch MBP with 4GB and it runs fine. so i guess my question is should he upgrade to 4GB or 6GB? Also what is the best type of ram to buy. i found this but i do not know if it is any good http://www.newegg.com/Product/Product.aspx?Item=N82E16820139083 thanks in advance!