|First off, some questions:|
Is the computer joined to the domain?
Was sysprep /generalize used on the original machine before the initial system image was taken?
Are you logging onto a domain or local user account when the slowness occurs?
If it is a domain user account, has the account been added to the local users or local admins group on the new workstation?
Have you checked the event logs for possible information as to the cause of the slowness? (Network errors, GPO errors, etc.)
Are you using folder redirection on any user folders? (Desktop, My Documents)
Are you using roaming profiles?
Do you have a complex login script?
Is the DC that the user is authenticating against local or remote?
Having the answers to these questions will help to point us in the right direction as to the cause of the slow login times.
IT Desktop & Network Consultant - MOS Master Certified, MCP, MCSA, MCITP - Windows 7, CCNA Certificate Pending, A+, Network +