As fas as the G3 being optimized for the way MacOS works, thats sounds like marketing BS.

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I asked one of the CPU guys at IBM about that, and he said, yes they did a lot of profiling of MacOS, and common opcodes were given hardware, while seldom used instructions were done in microcode. In other words, the G3 was a 603e tuned for MacOS.

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I read a Usenet post about a similar thing in comp.arch, but it was for the older Motorola 68k series.
It was the same thing, though-- you ran a profiler on your Mac which recorded opcodes, sent the data to Motorola, and they used it for further research and enhancement of future products.