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emulating a Z80 with screen refresh (specially on the amiga with the damn bitplanes) on a 68000 at a proper speed is just not possible.
It seems stupid, but emulation takes a lot of CPU power. The CPU itself isn't the bigger problem. Video refresh, on the other hand, costs a lot. You have to emulate the CPU but also the speccy video chip, and refresh it at a reasonable rate, when the speccy video chip can do 50 or 60 Hz.
You can disable sound, saves a little CPU. Or get a 68030 where emulation has more chance to run 100%
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