Agility is maneuverability. Fighters are by far more maneuverable than the ships. And they're faster too. As it should be in something that's basically WWII style combat in space. Even in modern warfare, a fighter is much faster than a carrier or any other ship in the navy. One of the US Navy's nuclear carriers, Nimitz class, or even the Enterprise, which has no vessel class, as she was a prototype, with a public top speed of some 48 knots, probably really can pull about 60, and no problems with motors burning out like on the AEGIS cruisers and tin cans, who might keep up for a little while, but not long, whereas the carriers with the steam generated by nuclear reactors can sustain their top speed as long as the equipment will take the vibration. Even so, fighter craft go a LOT faster.Your basic F-14 takes off from a ground based runway at 150 Kts, and can break the sound barrier. The F-22 cruises about about 1.5 mach with no afterburner. Fighters being much faster than ships is expected. Hell, the USAF F-15 has a positive thrust to mass ratio, meaning it can accelerate in a sustained climb. Fighters are faster than capships and supercaps, period.