Yes, who knows if the engine will realize that the creature moves fast and how it does? From what i've seen, it seems that a long body and many legs is the fastest i've seen. I'm not sure if it can recognize a cheetah-ish creature from a leopard-ish creature, which doesn't move as fast. I'm sure it will be easy to figure it out, as there is a rather large speed meter at the top right of the creature editor pictures and movies i have seen.