Switching accounts is extremely slow in Leopard

I've just updated my iMac to Snow Leopard and all seemed work fine until i decide to switch to another account I have on my Mac: logging out and logging into an account is extremely slow and seems to freeze leopard (it requires about 2 minutes to switch and there are no possibility to control the machine). Someone experienced the same problem or can help me?
I've looked around my configurations and all look fine...I think!
Thanks in advance!

Craig that's the only thing that looks strange in my console (from kernel.log):
Sep 7 01:37:16: --- last message repeated 1 time ---
Sep 7 01:37:19 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:37:49: --- last message repeated 1 time ---
Sep 7 01:37:52 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:38:22: --- last message repeated 1 time ---
Sep 7 01:38:25 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:38:55: --- last message repeated 1 time ---
Sep 7 01:38:58 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:39:28: --- last message repeated 1 time ---
Sep 7 01:39:31 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:40:04: --- last message repeated 1 time ---
Sep 7 01:40:04 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:40:34: --- last message repeated 1 time ---
Sep 7 01:40:37 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:41:07: --- last message repeated 1 time ---
Sep 7 01:41:09 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:41:39: --- last message repeated 1 time ---
Sep 7 01:41:42 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:42:12: --- last message repeated 1 time ---
Sep 7 01:42:15 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:42:45: --- last message repeated 2 times ---
Sep 7 01:42:51 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:43:24: --- last message repeated 1 time ---
Sep 7 01:43:24 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:43:54: --- last message repeated 1 time ---
Sep 7 01:43:57 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:44:27: --- last message repeated 1 time ---
Sep 7 01:44:30 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:45:00: --- last message repeated 1 time ---
Sep 7 01:45:03 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:45:33: --- last message repeated 1 time ---
Sep 7 01:45:36 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:46:06: --- last message repeated 1 time ---
Sep 7 01:46:09 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:46:39: --- last message repeated 1 time ---
Sep 7 01:46:42 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:47:12: --- last message repeated 1 time ---
Sep 7 01:47:15 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:47:45: --- last message repeated 1 time ---
Sep 7 01:47:48 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:48:18: --- last message repeated 1 time ---
Sep 7 01:48:20 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:48:50: --- last message repeated 1 time ---
Sep 7 01:48:53 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:49:23: --- last message repeated 1 time ---
Sep 7 01:49:33 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:50:03: --- last message repeated 2 times ---
Sep 7 01:50:16 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:50:46: --- last message repeated 1 time ---
Sep 7 01:50:48 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:51:18: --- last message repeated 1 time ---
Sep 7 01:51:21 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:51:51: --- last message repeated 1 time ---
Sep 7 01:51:54 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:52:24: --- last message repeated 1 time ---
Sep 7 01:52:27 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:52:53: --- last message repeated 1 time ---
Sep 7 01:52:53 imac-di-mariano kernel[0]: systemShutdown true
Sep 7 01:52:53 imac-di-mariano kernel[0]: systemShutdown true
Sep 7 01:53:23 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:53:53: --- last message repeated 1 time ---
Sep 7 01:53:53 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:54:24: --- last message repeated 1 time ---
Sep 7 01:54:39 imac-di-mariano kernel[0]: disk1s2: I/O error.
Sep 7 01:55:09: --- last message repeated 3 times ---
Sep 7 01:55:09 imac-di-mariano kernel[0]: Kext loading now disabled.
Sep 7 01:55:09 imac-di-mariano kernel[0]: Kext unloading now disabled.
Sep 7 01:55:09 imac-di-mariano kernel[0]: Kext autounloading now disabled.
Sep 7 01:55:09 imac-di-mariano kernel[0]: Kernel requests now disabled.
Sep 7 01:55:12 imac-di-mariano kernel[0]: disk1s2: I/O error.
The second disk is the one where I've Time Machine configured to start backups. It looks like Snow isn't able to correctly access the disk. I've never experienced something like that with Leopard. I will try to initialize the disk again with Snow and let you know soon.
Anyway, I'll check inside my console again if there are more errors on third part software.
Ciao
Message was edited by: morianas

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Message was edited by: new2appletv

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