Metalbrain
Still Fresh
After applying Squidge's hack, I've been able to reduce CPU speed needs to 120MHz (frameskip 1)/166MHz (no frameskip), and the result is here:
http://www.speccy.org/metalbrain/GP2Xpectrum1.3b1.zip
http://www.speccy.org/metalbrain/GP2Xpectrum1.3b1.zip