After 10.2.5 installation last week, I have run, Disk Utility, System Optimizer 4.0 and Cocktail. I have restarted my Ti-500 several times, to see if I see any start-up time improvement with 10.2.5. My fastest start-up time, post 10.2.5 installation, is 1 min 4 seconds. This is not faster than before, but on the other hand, I have never measured a faster start-up. I measure from when the Apple first appears until the first bounce of an application that starts at LogIn (that is - for me - Folding at Home 3.24). My conclusion is that start-up time is unchanged. regards, Trevor