Hi All Here's a test binary for you OS X users to try: http://rcdrummond.net/uae/test/uae-osx-sdl-20041029.zip I'm seeing up to a 40% increase in CPU speed with that one. I finally figured out why GCC was producing such crap code on OS X, and I also implemented optimized handling of the 68K condition flags. Give it a whirl and tell me what you think. ;-) Cheers, Rich