I have a 1.66ghz core duo with 512mb memory. The issues I'm having are as follows. Sometimes, when I bring it back from screensaver, I have the little pinwheel that isn't moving. Then, it'll finally snap out of it. When I switch between users, the move doesn't seem smooth, but kinda jerky. Sometimes, when I try to minimize safari and maximize iTunes, I get the spinning pinwheel for awhile, then it'll finally do it. Is my memory the problem here? Please don't tell me this is a stupid question. I'm seriously new to the macworld and am unsure on how macs are supposed to operate. My dashboard tells me I have 5mb memory free. Is THIS my issue. Thanks to all of you for the help in advance.