roScreen, Idle Time and Wait

Hi All. I have been playing with an interesting issue as of lately:

I'm working with roScreens and it seems that after 10 minutes of inactivity the usage of wait(timeout, port) takes
longer than what stated in timeout. Rendering the app unresponsive. This port is attached to a roUrlTransfer object.

I wonder if this is an issue some others have found, and if someone from the staff could elaborate in what happens
under the hood (GC, etc) when the blank screen (the screensaver mode for roScreen based apps) appears.

Also, does "wait(0, port)" is the same as doing port.GetMessage()?

thank you all in advance.