Laxer3a who is one of the coders of the highly promising Snes emulator for the PSP called Snes9x_TYL posted something of interest to those waiting for the next release of their great emulator:
"It depends on games but you can expect a change between +5% to +12% on the frame rate.(So +2 to +7 fps)
If you remove some effect (add/sub), and remove the sound you have rougly 60 fps on mario kart or FZero in the next release.
There is some tuning still possible, I will have a look next week end :-).
(GCC assembly output is just so so... Assembly rewrite seems a not so bad idea)."