>> As both MorphOS and Amiga OS 4.1 utilize Altivec [...] it's not the question
>> if the Tabos performs slower but only how much it performs slower.

> that depends on model according to this posting

That's what ernsteiswuerfel expressed actually, i.e. that opposed to MorphOS on G5 (as well as OS4 on Nemo/X1000), OS4 on Tabor (as well as on certain other boards like Cyrus/X5000) can't use AltiVec because Tabor's CPU (as well as certain other boards' CPUs like that of Cyrus/X5000) does not have AltiVec.