Thanks for reporting! I believe the MegaSTe emulation in Hatari is a little faster than the real hardware. Could you do a little benchmark for me? Rename CNC.TOS to CNC.TTP, then pass "-xyq" as parameters. After running a little demo, it shows some measured data. I'm mainly interested in FPS. You could try once with 8MHz and once with 16MHz+cache to see if there is really no diffeerence. A plain 8MHz Atari STe will get about 3.7fps in Hatari, a 16MHz Mega STe will get 5.6. Here are more benchmark results.