That should be very do-able (if the source for WarpSNES is available) as there are only 5 releases between between SNES9x 1.42 (last WarpSNES) -> SNES9x v1.53 (latest)
As accuracy goes up (in mature emulators) their speed tends to go down. But you never know.
Edit : Bah! The source for WarpSNES is no where to be found