after testing a while I have the following results:

-Zenworks Agent (10.2 or 10.2.1) is installed on a fresh maschine:
Power on - loaded desktop with Nalwin: 2.30 ~ 3 minutes

-Zenworks Agent (10.1.2) installed since introduction Zenworks 10, the machine got all updates (10.1.3, 10.2, 10.2.1):
Power on - loaded desktop with Nalwin: 5 ~ 30 minutes (very different, several machines tested)

If I uninstall the updated Zenworks Agent on the maschines and reinstall the current Zenworks Agent (10.2.1), I have logins like the first case (~ 3 minutes).

Why??? Are updates bad? Makes an uninstall and reinstall with the current Agent more sense?
If I think about the frequency of new ZenAgents.... oh oh. Help!

What do you think about that? Similar results? Any suggestions? Or a solution?