No it's right. The two that run that speed are mother/daughter, with high prey drive, who are the strongest and fastest on my yard. I actually think its off by reaching its limit. You have to remember that what you are going by is a Grey Hound running 42 miles an hour on the GROUND. We are talking about running on a slat mill(with bearings) every time it turns, it doesn't stop, but keep spinning. Compare running on the ground and on a slat is like comparing apples and oranges. Do you understand where I'm getting at? And yes they are blowing smoke out their ass..I'd have to cautiously slow them down by slightly turn on the brake or they'll fall off.