Slow Login, Slow "Fast User Switching"

Hi--I have a Core Duo, Intel iMac running Leopard 10.5.2. The initial log-in is very slow (several minutes) for any user--whether it's the initial boot up or switching users using "fast user switching." But all seems to work well once the login completes. After a user, or multiple users, rather, are logged in the first time, fast user switching works normally.
Also, if two or more users are logged in, and a user logs out, it takes forever for one of the other logged-in users to log back in.
I've tried turning off fast user switching and rebooting; I've disconnected all USB devices; I've repaired permissions; I've rebuilt the directory structure using Disk Warrior 4.1; I've created new accounts (the problem is identical in all accounts); but theses measures didn't work. I know previous versions had issues with font caches, but I'm not sure how to delete these in Leopard. Anyway--anyone else encounter this problem? Thanks!

Well, I did an "Erase and Install"--and THAT didn't get rid of my problem... Well, I SHOULD say it did--for the first boot-up into the new system worked flawlessly, but I courageously and foolhardily chose to "Transfer" my files and settings from my backup disk. Voila, the the problem of the "blue screen of death" (not really death, just long delay) was restored, along with all my data. So I did another "Erase and Install," and this time only manually restored my user accounts--and I'm happy to report: ALL IS WELL....
I'm thinking that the troublesome application that was conflicting with Leopard was the "Boot Picker" pane that I had trouble disabling or deleting from the previous installation of Tiger. I do have a Windows partition, but apparently Boot Picker should not be used with Leopard. I did go through the "Boot Camp" installation process in my first upgrade to Leopard, but that process didn't remove the earlier installation of Boot Picker.
This is still just a guess, and I'm hoping, as I continue to reinstall miscellaneous application on my newly re-installed system, that the problem doesn't come back (or if it does, it comes back at a clearly-identifiable moment).
Message was edited by: Angelo -B

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