It seems that Cheetahs aren't that fast. Measured accurately at last by researchers they top out at 53kmh. Usain Bolt can manage 44kmh. But where they score is in acceleration and sudden changes of direction. Agility is more use to them than outright speed it seems; in the last minutes of an antelope kill they need to jink and jive to get the prize. In everyday life, too, in the mildy metaphorical sense, I'd rate agility anyday against straight ahead speed.