I am running a 450mhz AGP PowerMac with 512mb RAM. This computer soared under 10.3.9. As soon as I installed Tiger, it's SUPER slow. I mean, you'd think I was working on a Compaq Presario! I've seen little bug warnings here and there, like some USB hubs slow down Tiger, but I unplugged mine with no help. The "Mac Genius" at the Apple Store couldn't offer any suggestions at all. I can't believe that Tiger is that much of a processor hog compared to Panther. But maybe it is. Does anyone have any tips for speeding things up? I'm running 10.4.2. Thanks!