All three parts of filmmaking [writing, shooting, editing] contribute to rhytm. You want the script to be a tight as possible, you want the acting to be as efficient as possible on the set, and you have enough coverage to manipulate the rhythm in the editing room, and then in the editing room you want to find the quickest possible version, even if it's a leisurely paced film. I definitely in filmmaking more and more find writing and directing a means to harvest material for editing. It's all about editing.
