I have a 2007 MBP that might be in need of an upgrade. Recently I have been working on large photoshop files, and with that running along with lightroom and itunes, my computer is superlaggy. Will upgrading my 2gb ram too 4/6 gb increase performance? I've read that my computer can take 6 gb, but will it be all used? Will this even help? here is my set up MacBookPro3,1 Intel Core 2 Duo 2.2 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 4 MB Memory: 2 GB 500gb 7200rpm HDD thanks for all your help. ps - would any of this help the laggyness when i connect my mbp to an external screen?