@JavisPedro: I'm really sorry I've insinuated on making no progress.
I've seen the last update (thought it was coïncidence, lol), but things are working far more smooth. Graphics looks fine (to me) and sound is playing, albeit somewhat choppy. With the framerate on 2, Zelda plays ok, not very smooth, but buttons pressed does have a reaction, not after 0.3 seconds or so.

Thank you very much!