I'm searching for a rhythm game that can run on a crappy Linux laptop
Osu! runs like crap under wine
sepmania is even slower even though it has native Linux support
Old bemani PC's from Konami rhythm games such as beatmania, sound voltex, pop'n music, and jubeat all run on shitty optiplexes.
If you know where to get the data, you can probably run it on your rig, provided you have the correct controller