To me m68k seems something like 10 000 times slower than modern hardware, not a million times. From the demo descriptions I get an impression (though there are no benchmarks to be sure) that it's much more limited than what could be done on a m68k.
So a ~40-year regression in performance.
I was thinking of the later chips in the 68k series, which got much faster over the years.
Calling this a "regression" is nonsense.