Our household 2009 iMac 27" does not get much use now as we rather do our browsing on the iPad or my Macbook Pro but the main reason it does not get used is that is it so deathly slow. Much slower to use than any Windows PC I have ever had and that includes old 486 ones. We see the beach ball more than we see anything else and I cannot quite figure out what the problem is. We only really use it for web browsing and some photo retouching in iPhoto, some MS Office stuff but just tiny docs and spreadsheets. We do have 3 accounts set up on it and it only has 4gb but surely this should not turn it into treacle? We do have a time machine hooked up to it. It got really slow when we upgraded to Lion so maybe that is it? Hints anybody?