portage-ng / portage / app-shells / zsh / 5.9-r7
pmerge --pretend --verbose
[ebuild  N     ] dev-libs/libpcre-8.45-r4:3::gentoo USE="bzip2 cxx jit pcre16 readline (unicode) zlib -libedit -pcre32 -static-libs -valgrind" 1.5 MiB
[ebuild     UD ] app-shells/zsh-5.9-r7::gentoo [5.9.0.3-r2::gentoo] USE="gdbm pcre -caps -debug -doc -examples -maildir -static -valgrind" 3.2 MiB

Total: 2 packages (1 new, 1 downgrade), Size of downloads: 4.7 MiB


 * Running sanity checks...

 * resolver plan required 27 ops (0.02 seconds)

Wall time
0.441 s vs. 0.028 s for portage-ng