To those people who are anxiously waiting for their R4DS to arrive, rejoice!! I've tested about 3 ROMs until now. On R4DS there is no speed setting whatsoever. Save game is detected automatically, although I there is some kind of database in the OS where is has savedata type information. Castlevania: PoR = animation intro runs perfectly on R4DS with Kingston 1GB MicroSD. Metroid Prime: Hunters = Runs fine, no slowdown in intro. Elite Beat Agent = Runs fine. Can't test the download play as I've only got 1 DS... So, far I happy that I've made a VERY GOOD choice, cause I was worried that I would have slowdown problems like Supercard.