Hi Jeroen,
I'm using the same system more or less at the university of Twente. Can't see your file, the seems to be no attachment in your post. In my system I've also problems with the framerate, without a visual display on the front panel the CCD camera easily manage to save 30 frame per second to the harddisk, but with a visual display the framerate drop to below 5 fps. Please repost your file, can't see how you can measure fps in a stacked sequence now. Will have a look soon!
Jeroen