>some NeXT-Stations and noticed, that the test obtains about a third part less
On NeXT Station running NeXTSTEP 2.1:

marvin> bin/gap-3.2 -m 4m -g -b
gap> ReadTest("tst/combinat.tst");
$Id: 1.html,v 1.2 2004/04/21 15:03:37 felsch Exp $  18182 GAPstones

This is slightly more than the reported 16484 GapStones for GAP 3.1,
as expected. Both executables were compiled with GCC 2.x.y. However,
if you compile GAP using CC (which is GCC 1.36) the performance will
drop.

best wishes
Frank