I've tested out a few of these auto-beatmap generator web games. What I'm impressed is how well the program turns mp3s and other formats into decently-made beatmaps, even with faster paced songs. Additionally, the optimisation is great, even loading a playlist that has roughly 72 hrs of playtime without much delay. No lag either. Only problem might be that reconfiguring keybinds isn't available? I prefer df-jkl for five note beatmaps, so I'd end up replacing space with the k key. However, I've yet to try the downloadable version, which I'll do. All in all, quite impressed!