Mac users interested in Kigb for speed up generally download:
KiGB is a Game Boy and Super Game Boy emulator for the Mac. It was made by Richard Bannister, who's also worked on Nestopia and other emulators for the Mac. Nestopia and KiGB are identical, with the exception that one emulates the NES and the other the Gameboy.
Additional suggestions for Kigb for speed up by our robot: