That SDC performance is very fast, but musically repugnant.
That is false , Think of this Etude as a painting, if you stand to close you will not see the full picture, for example if you magnify a painting you will see dots and strokes. Hence if this Etude is playd slowly you will see the dots and strokes and not what it actually is, the style demands a cetin tempo, because of its repetative nature.