I am a recent switcher who picked up a 2.66 gig Mac Pro. I experience an awful lot of lags and beachballs and I can't figure out why. I recently upgraded the RAM on it to 4 gig. I put my iPod music collection on it's own separate, fast drive. I experience very frequent pauses doing simple things like opening iTunes or Safari. Not knowing much about admin in OSX, are there any tools that could point to what could be wrong? I poked around in Activity Monitor and my page outs are virtually non-existant. I have a ton free disk space and lots of free RAM. I don't quite know where to look at to figure out what could be wrong. I do have Photoshop and MS Office loaded, but experience the lags even with nothing on them running. And suggestions?