Nope, as the lag message says, it's got to do with your web browser, and can't be fixed unless you restart it. Try to avoid those songs with lots of notes.
Really cool game, as a Taiko fan, I absolutely love the things this game does with the 2-note format! Some of the base and custom charts I've played are really freaking cool, and I replay them often. Other than a VS mode (which I saw below that it isn't a priority right now), I'd like to suggest showing the map's name above the notes' box, and maybe even a progress bar. But, more importantly, showing the max combo and score records in-game, it'd be really helpful when going for replays!
Basically, what happens here is that the blue space links to a pass-by event space. When I delete it, the destination data still persists, so placing a new space (which takes that same space ID), the blue space references the new one unintentionally, and doesn't reveal it until clicked, which can cause unexpected junctions in-game.
Hey ahí! Si entiendes esto, entonces sabes hablar español. Alguna vez quisiste que todo el juego esté en español? Pues revisa este mod: https://gamebanana.com/mods/484119
