We hear lots of advice about blade angle, pressure, and length of strokes, but I've never heard anyone mention the speed of the stroke. It seems to me that the blade would cut more easily if the stroke is swift rather than slow. As a woodworker, I think about using a hand plane. It takes a certain amount of speed to get a good cut or the plane sort of chatters its way down the board. Do you suppose the same thing might apply to shaving? Should we be advising short, swift strokes?