This may be a little difficult for me to explain, I am afraid, because I hardly know the Danish terms and certainly not the English. But I got to ask myself: Do I feel lucky? And just now the answer is Yes, punk!
Most of the time it suits me fine to have Vista giving priority to the programs. But I have more than 6.000 images in a single folder, and to wait for Vista to refresh the thumbnails is a p@|n in the @$$. For this reason I would very much appreciate if it could be made easy to toggle between "Give priority to Programs" and "Give priority to Background Services". A simple AHK script.exe, maybe.
The option in Danish: