We have been having very long boot times after installing endpoint encryption on Dell laptops. It is not just one model, we see the behavior on multile models. D620's, D630's, E6400's and E6410's. Can take roughly 5-10 minutes to get to the Windows log on screen. Wanted to see if anyone else is experiencing this problem and if there is a fix?
I would try to turn it off, as a test.
There is possibility that in your setup, EEPC SSO cannot use cached Windows credentials and waits for network connection to display logon screen.