Hi there!
Yes it’s expected that you only have to enter the password once and for all.
If you want to know yo’d have to check in the Rotski’s configuration panel in Cubase if this setting is enabled or not.
Unfortunately as a matter of a fact these networking issues are highly depending on your own configuration and the OS itself. Cubase iC Pro is doing nothing else but using the network layers of the OS. We are still improving as much as possible the efficiency of the communication but we cannot go faster than your network. I would suggest you to ping your device from your computer and see the natural latency of your network. Here at work with my ad-hoc connection it’s hardly impossible to lower the latency to less than 20 ms for instance.
Hope to have answered your questions!
Cheers,