The standard windows dream scene player will pause the movie/video when a window is maximized. I see my processor use fall from 50% on both cores to 3% !!
Deskscapes' renderer will not do that with the video files.
It would be nice if it did so for both the video files and the animation-type files (a la spinning earth) both, although on a side note - I am very impressed that the animation files take maybe 15% of one processor 
Thanks
Ruben