Why does Windows take a long time to boot in a domain?

Question

Windows

Hello.
The essence of the problem is as follows.
There is a domain.
Win7 and WinXP machines have taken unusually long to boot. After entering the login/password on the Welcome screensaver, the car will load from 3 to 15 minutes. If you pull out the LAN cable, then after entering the login / password, the OS loads normally.
On one machine did a little experiment. Demolished the user's folder, cleaned the registry branch. I rebooted, logged in as a user again, his folder was created, and everything worked as before, i.e. normal loading.
What could be the problem?
At the moment, the problem remains on machines with Win 7.

Answer 1

application of GPO. see how DNS is configured, read the logs

Answer 2

Are profiles local? And yes, see what policies apply and what they do. Maybe you are working out policies for copying gigabytes of data during logon)))

Answer 3

M20410C - Windows Server 2012 R2 Basics