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I need a way of profiling performance on real hardware or a way of more accurately simulating hardware performance via emulation.
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I suppose this could be done with some code I've written that logs the current PC at each VBLANK interrupt and python post processing to gather the addresses.
Each VBLANK could turn into "each scanline" with a custom copper interrupt.
BTW I suppose that you optimize blit heights so you don't blit behind the road just to overwrite it by the road?
The difficult part of such a project is that you don't know if you can make it run properly despite all optimization efforts. Reducing framerate can be a solution ... to a point.