portage-ng / portage / dev-lang / ocaml / 5.3.0-r1
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-lang/ocaml-5.3.0-r1:0/5.3.0::gentoo  USE="ocamlopt -emacs -flambda -latex -test -xemacs" 6094 KiB

Total: 1 package (1 new), Size of downloads: 6094 KiB

Wall time
1.930 s vs. 0.008 s for portage-ng