Hi guys, Long story short, I've had this 15" MBP for about four years now. It's still running pretty well, especially considering its age. The only time it has issues is when I have multiple programs open that are fairly intensive (it doesn't like it when I have Photoshop and World of Warcraft open at the same time, for example). My question is... Is it worth it to upgrade the RAM in my machine? Right now I'm sitting at 2 gigs, and I'm considering upgrading to 4. Will it boost my performance significantly? Thanks, and sorry if this question is newbish.