That is incredibly fast. In the lore of the 40 yard dash, fans have been saying that track guys can beat the NFL guys and people have tried to cut up videos of the 100 meters to see what the 40 time would be. But that is not as accurate as a timed run at 40 yards. Usain Bolt is the fastest at 100 meters, but his speed comes after 30 meters when most sprinters level off. So he might not be the fastest in the 40.