reproducible with 070622,

Opening satellite view affects scene scrolling much more then it can be, current realization redraw full scene just to
show gray rectangle in new position, since big scene have to use clipping and I use it for scene view if satellite view
will redraw only previous gray rectangle position and new position it can improve scrolling significantly.
PS. There still cases which I don't yet see how to resolve so didn't file it yet (addition of widgets, selection etc
still may be slow with overview opened even if main screen contain only few objects)