portage-ng / portage / dev-vcs / git-flow / 1.12.3-r2
emerge -vp

These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] dev-vcs/git-flow-1.12.3-r2::gentoo  73 KiB

Total: 1 package (1 new), Size of downloads: 73 KiB

Wall time
1.937 s vs. 0.003 s for portage-ng