I've been getting the beach ball almost constantly on my mid-2010 MB. 90% of the time I just use my computer to browse the internet with either Safari or Firefox. It seems like every time I open a new tab or switch tabs in the browser, I get the beach ball. Sometimes it's only for a few seconds, sometimes it's for about 15 seconds, and other times everything seems to freeze up for almost a minute. Opening PDFs seems to bog things down quite a bit as well. At first I thought it was because I had a lot of tabs open in multiple browser windows, but I do this all the time on the slow Dell I use for work and never have an issue. I typically have iTunes, Bean, and Mail running at the same time. Anyway, I'm guessing this isn't normal. Should I try an OS reinstall, take it to the Apple store, or what? Thanks.