Hello, i tested an i5 4gb in a store today and 2 finger pinch zoom at a ~2 MB test picture was a bit laggy. Not too much, but far away from instant/"live". On the other side, zooming with keyboard shortcuts is no problem as on almost every average pc. I'd like to know, if the i7/hd 5000 is significant faster at these "touch navigation things". By the way... is cpu or gpu power necessary for fluid pinch zoom in Win8?