I hunted and hunted and could not find anything that says an ultra fast memory card will improve the performance of a camera.
In most cases the camera circuits themselves are the limiting factor as regarding speed.
Check the documentation for your camera and see if there is any mention of what speed memory card to use. If there is nothing, then assume that an ultra-fast memory card will not have any advantage.
A salesman is trying to sell me the merits of ultra-fast SD memory card for my digicam. Are these cards worth the money? I haven't seen any mention of them on any site except theirs.