I was watching a movie(streaming) and I noticed that at about an hour in, it was skipping frames pretty badly, while sound appeared to be fine. It was properly cached. It seems to me this happens when watching large streaming videos. Is this possibly a gpu issue? How do i really monitor if I'm saturating the gpu's ability? I couldn't find anything in activity monitor that appeared as straight forward as monitoring cpu use or ram use. Is a mac mini (3,1) simply insufficient for this task?