There has been a lot of research to find the fastest fauna in the world. It has taken research, spanning across decades to determine the fastest insect. In 1991, scientists at the University of California concluded that the fastest insect is the American Cockroach at a marvelous speed of 5km/hr.
However, this precedent was revised by scientists in the Netherlands in 1996. They found that the Australian Tiger Beetle surpassed the speed of the American Cockroach and ran as fast as 9km/hr, making it the fastest insect in the world yet.