I have the lower-end MBP, and I've noticed it going very slow. I know it's the lower-end model, but I don't think it should be doing this. I'll be visiting a simple web page and when I click on something, it will freeze and that little rainbow spinning thing will pop up. Sometimes I'll even click on a link, and it won't direct me to the page (the white hand with the pointer won't even pop up when I go over the link with the mouse) and it will just freeze and then the page will load. What could be wrong?