Passage through a Stargate's wormhole is depicted as a visual effect of shooting through a tunnel in space, although this is just a visual aid as travelers are not conscious during the trip. The average travel time between Stargates is 3.2 seconds. In the movie and early "SG-1" episodes, travelers exit from the Stargate "frozen stiff" and at high speed (often being knocked from their feet), feeling as though they have been on a "roller coaster ride". The character Major Charles Kawalsky describes Stargate travel as worse than pulling "out of a simulated bombing run in an F-16 at eight-plus "g"". In later episodes the experience is no different from stepping through a door, explained as a result of refinements made to the dialing computer at the SGC.