Thank you for taking the time to reply.
I have no real problem yet, since my code is in the early stages of development.
I posted the question hoping to get some general rules of thumb regarding the behavior of QGraphicsView.
I'm an MFC programmer, new to Qt, so I just started exploring the capabilities of Qt's paint engine - which
are a lot!
I've taken the time to examine the implementation of QGraphicsView in further detail and I think I got a
better understanding of how it works.
As far as I'm concerned it is the typical dilemma whether to "paint all, but in a simple way" or
"try to be smart, but suffer the overhead of additional calculations".
Anyway, thanks again.