Salute!
Actchally my dear Royalists, I think you will find the colonist's F-106 was likely fastest fighter, and I do not count the YF-12 vehicles, as nothing has come close to them since 1967 b. ut they couldn't "fight".
The Six could turn with the best of them and if chasing down a Bison could get to M2.5 The Zipper, aka 104, was about the same and we have war stories of them cruising at 70K from here to Homestead. Personal contacts upon request.
The Zipper was a rocket, but couldn't turn well once slow. The Six could turn like anything in the air, but lost energy a bit more than you want. It was still the best Air Defense Command close fighter that existed in my days back then ( 66 to 70's). The Duece could also do the "bat turn", but didn't have the big motor like the Six to regain energy. Trust me, nose-pointing capability is great. You just have to trade off with the energy game.
For flat out speed nowadays I would take the F-22 at 60K.
Gums opines....