The Water Ape Space Battleship had a considerable speed.
This was thanks to the atmospheric conditions of the alien planet, which caused conventional aircraft and jet aircraft on the Azure Star to be unable to fly normally.
The alien planet did have an atmosphere, but its density was extremely low, less than one percent of the density of the Azure Star's atmosphere. Its primary components were carbon dioxide, nitrogen, and argon, with very minimal amounts of oxygen and water vapor.
Thus, the atmospheric conditions of the alien planet could not provide sufficient lift for aircraft while almost providing no air resistance.
A five-meter flight above the surface of the alien planet would be equivalent to flying at an altitude of thirty thousand meters on the Azure Star.
This was both an advantage and a disadvantage for the Federation.