> From suspected and "really nice" 2.4× performance to just "nice" 1.0× performance...
Someone as well-read as you will know that it is better to avoid repeating the same phrases in the text

Ok than I summarize it: very nice!
AmigaOS3: Amiga 1200
AmigaOS4: Micro A1-C, AmigaOne XE, Pegasos II, Sam440ep, Sam440ep-flex, Sam460LE, AmigaOneX1000
MorphOS: Efika 5200b, Pegasos I, Sam460LE, Pegasos II, Powerbook G4, Mac Mini, iMac G5, Powermac G5 Quad