time for each in *.txz; do ~/projects/cpkgtools/build/src/installpkg --root /tmp/pkgtest/ $each; done;

real 37m2.646s
user 26m20.324s
sys 1m11.901s

brzdi to hlavne dvojite prhladavanie velkych balikov, ako kernel source (niekolko minut), tetex, xfce a pod.

edit: jasne, da sa to obist nacitanim metainformacii z textaku bokom, ako to robi installpkg, ale ked sa polka balikov da spravit tak, ze to netreba, myslim, ze to je len hack.