So I am ready to throw my 24" iMac (white) through the window. I am having it freeze and run utterly slow pretty much everyday at least once a day. I am running the latest version of Leopard and all my software seems to be up-to-date. I am usually running photoshop, iPhoto, or something big when my computer bogs down but last time I checked that shouldn't matter.... OS X seemed to be pretty good at handling more than one large application open at a time. It's a 2.16 GHz Intel Core 2 Duo, 2GB 667MHz DDR2 SDRAM, with a NVIDIA GeForce 7600GT.