This is a straight port of VisualBoyAdvance SDL. It isn’t isn’t very fast and there is no sound. You can tweak frame skipping and other settings in VisualBoyAdvance.cfg. Changes:

The Emulator has been recompiled and now games like Egg Mania work up to 50% of real Speed, theres also a MHZ selector to get better performance by raising the CPU (be careful), this also supports GameBoy Mono and Colour Roms.

http://gp2x-emulation.dcemu.co.uk/gp2xvba.shtml