I've got a current MBP (2.66GHz, 4GB RAM, 320GB HDD) which, when purchased a couple of months ago and loaded with all my apps and files, ran like a dream - started in under 30secs, Safari opened almost instantly etc. So why now is it having major poblems and slowing down so much? Here are some examples: - Safari takes a long time to open (a good 10secs+) - iphoto is a complete pain. Takes a good minute or so to open, is very sluggish with regular beachball action, won't allow me to drag photos into other apps (like mail) and takes a good three to four minutes to shut down. - system startup takes a good couple of mins. - Apps regularly shut themselves down. - when opening iCal I always get a bar come up saying 'Upgrading calendars' for about 30secs. My HDD is about half full so I don't see why it's having such trouble. If anyone could help me understand or help me sort it, I'd be grateful!