Have you ever turned on the light in the kitchen only to notice, in your peripheral vision, a swiftly disappearing blur? You're not imagining things; cockroaches are indeed that fast. In fact, they are considered one of the fastest-running insects on the planet. In response to light or movement, American cockroaches move at a rate of 50 body lengths per second. That's the equivalent of a person running at 210 miles per hour!