We discovered in one of our customer environments that there was a long delay at computer startup time with Windows 10 build 1607.
Now we had an acceptance environment where the issue did not occur, only difference was that DA was enabled at production site and not at the acceptance environment.
So we activated verbose messaging using :
Computer -> Admin Templates -> System
… This revealed a 60 second timeout during startup : waiting for workplace connectivity.
A quick lookup revealed a default one minute wait time for connectivity before processing gorup policy. So we modified the following policy :
Computer -> Admin -> System -> Group Policy
This resulted in a much quicker computer startup.