Also Atlivec was the only reason that OS 4 was constantly higher than MOS in the DC-net stats...
Actually MorphOS was constantly higher than AmigaOS (in RC5-72, where altivec has some real impact). OGR-P2 hybrid core has some benefit aswell, but nowhere as much as with RC5-72.
I assume since you're using past tense, you're speaking about RC5-72 which got cancelled by RSA recently.