portage-ng / portage / sci-electronics / irsim / 9.7.93-r1
pmerge --pretend --verbose
[ebuild  N     ] dev-lang/tk-8.6.17:0/8.6::gentoo USE="threads truetype (-aqua) -debug -test -xscreensaver" 4.4 MiB
[ebuild  N     ] app-shells/tcsh-6.24.16::gentoo USE="nls -man" 938.2 KiB
[ebuild  N     ] sci-electronics/irsim-9.7.93-r1::gentoo 463.3 KiB

Total: 3 packages (3 new), Size of downloads: 5.7 MiB


 * Running sanity checks...

 * resolver plan required 36 ops (0.02 seconds)

Wall time
0.446 s vs. 0.045 s for portage-ng