>>52266117Academy main hall? It's indoors so it's got minimal amount of shit to load and it's fairly large so you can run in circles.
If you're post-game, the area zero entrance, again, it's room with nothing in it and it's a decently sized rounded area around the teleporter so you can run in circles unobstructed.
If you wanna do it while riding though, probably the island in the west I circled in the image. It's far enough from the rest of hte land that most of the stuff will unload, and if you look west while riding around you'll look out towards nothing in particular so there's nothing to lower your framerate.
