The reported problems are gone in CURRENT:
# dmesg|head -n2
OpenBSD 5.4 (GENERIC.MP) #0: Sat Jul 20 17:56:10 CEST 2013
root@test:/usr/src/sys/arch/amd64/compile/GENERIC.MPtime buildsrc.sh takes 31 minutes. measured directly after building src (which was slow before):# time tar -xzpf /usr/releasedir/comp54.tgz
0m5.67s real 0m2.07s user 0m0.89s system
# time tar -xzpf /usr/releasedir/man54.tgz
0m1.26s real 0m0.45s user 0m0.30s system
Best Regards
Andreas

