I suggest the multi-platform emulator, Morphgear (
www.morphgear.com). It is capable of emulating GB, GBA, SNES, NES, Master System, and Genesis, to name a few. The SNES module is free when you download Morphgear, and it is faster than PocketSNES, YAME CE, and many others. It runs Super Mario World, Super Punchout, FF6, Chrono Trigger, Mario All Stars, and some others at full speed on my Axim X5 400Mhz PXA250.