Two of our users have been getting this weird issue where their login to the computer seem to take "ages".
The issue seems to go away if you turn off FileVault.
However we need to keep FileVault on, but as this only effects a small number of users it seems like this is some specific issue with just their computers.
Info about the computers:
- MacBook Pro (Retina) - Early 2013
- Mac OS X 10.8.2
- FileVault 2
Connected to Active Directory (Network Account Server)