the fastest speed ever recorded on a downhill race was 96.7, the average top speed of a medalist at kitzbuhl is ~85, and thats on the fastest section of the fastest course in the world. most downhil events have racers topping out between 75 - 80 mph.
people who are talking about getting clocked by a ski tracker app, keep in mind that those arent always accurate and may be swaying 10 mph in either direction. after all, it is a free iphone app, not a real GPS.