So it is actually limited to 144fps, which I had done because it helped when the hold notes were inconsistent. But now (since 1.6) they aren't so I should probably remove that limit in the next update. It shouldn't be limiting score at 144fps, but it might do that if the fps is lower, which would happen if you're on a lower hz screen (e.g. 60hz) because of vsync (which I'll also turn off next update)