I think it is a myth that OS friendly 68K programs are executed faster on OS4 or MOS, because their emulation is more lightweight.
Download
http://aminet.net/util/moni/sspeed26.lha.
Run on a modern PC and Mini G4 and compare the results.
Graphics work 3 to 30 times faster on the G4 1.33 GHz with Radeon 9200 than on Athlon 4400 with the 9600 GT PCIe.
Both MorphOS and Amiga OS 4 have graphics.library and layers.library supported by 3d hardware.
And Radeon 9200 is still much faster than one core in modern Pc.
