I have upgraded a couple of systems from 10.4, and I noticed they did not run quite as fast. It appeared to me that the hotfiles database was not being updated. I booted into single user mode and deleted the hotfiles database file, and then rebooted. It appeared to me that within one more reboot, the system was launching apps more quickly. Does anyone suppose that having the 10.4 hotfiles DB around is slowing or preventing Leopard from getting itself up to speed? Wouldn't the hotfiles DB be completely inaccurate after a replacement of the OS and libraries?