I was just about to start a new thread for my question but I suppose I might as well hijack this one.
What makes emulating this system so slow exactly, and is there much room for improvement? I would love to explore this system's catalog but it's not really feasible at the moment. As far as I know (which admittedly isn't very far), the architecture doesn't seem overly complex with just a single 68k which is a very common and well understood CPU. I'm cautiously guessing it's the floppy drive and/or sound system emulation, which was pretty high-end in it's heyday?
Probably more the video system, which is all custom, including CRTC, PCG (up to 2 tilemap layers and sprites), up to 4 graphic bitmap layers (16, 256 or 64k colours), and a text bitmap layer (16 colours only). It's not horrifically complex, but it's not simple, either.
Certainly speed improvements could be made, and are welcome. (Although yes, the floppy drives are slow, they are on any system, but only when in use)