PB is slow?!?! Okay, so I thought 1.67GHz would be totally godly (used to run a 933MHz). But apparently, it's not. I'm running iTunes, msn, ichat and safari and it's really slow for some reason. I haven't shut down since i got this computer...would that be the reason? Or do I need more RAM? I only have 512Mb of RAM....I've been sorting my iTunes library for the past 4 hours. Anyway, i was planning to stick in 2Gb of ram anyway...will this solve my problem or is there anything else i can do in the meantime?