portage-ng / portage / sys-devel / bc / 1.07.1-r6
emerge -vp

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

Calculating dependencies ... done!
Dependency resolution took 1.50 s (backtrack: 0/20).

[ebuild     UD ] sys-devel/bc-1.07.1-r6::gentoo [1.08.2::gentoo] USE="readline -libedit -static" 411 KiB

Total: 1 package (1 downgrade), Size of downloads: 411 KiB

Wall time
2.488 s vs. 0.007 s for portage-ng