This dance style differs from the Waltz mainly in its speed. The Viennese Waltz has about 180 beats to the minute whereas the Waltz has only about 90.
From the time in which the dance was first introduced until today, the Viennese Waltz has not really changed much at all. Despite being fairly simple, the footwork, lines, and movement have to be precise in order to really sell the beauty of the dance.