Citra runs Pokemon Ultra Sun just fine (above 90% speed all times) but when I play Ultra Moon my game runs at a constant 80% speed. Is this normal?
Hmmmmmmm, I don’t think so, as they are pretty much the same. But I don’t know anything more than that.
Between the two games, the day/night cycle is reversed, so it’s possible one of them is more demanding than the other (e.g. night having additional light sources.). Aside from that, though, the games should be running at the same speed, especially in stuff like indoor battles where the day/night cycle is not in effect.