Hi! Thought I'd share a trick I'm using: as debhelper's dependencies chain became really fat, you can gain a drastic speed-up (especially for small packages) by preinstalling debhelper into your base sbuild/pbuilder/etc image.
With debian/compat now mandatory, there's no benefit in testing this build-dependency manually: lintian will do that for you, with no false negatives (false positives for package-uses-debhelper-but-lacks-build-depends are harmless: all 3 depend transitively via dh-autoreconf). Thus, let's leave installing it over and over to those who build on tmpfs; those of us on eMMC or nbd -- or even a regular SSD -- can get this speed-up. Obviously, you need --no-install-recommends while doing so: things like init or xml-core could make you overlook a real missing B-Dep. And while we're here, do re-check whether you have eatmydata both installed and enabled (command-prefix=eatmydata) in sbuild configuration... -- ⢀⣴⠾⠻⢶⣦⠀ Meow! ⣾⠁⢠⠒⠀⣿⡁ ⢿⡄⠘⠷⠚⠋⠀ Collisions shmolisions, let's see them find a collision or second ⠈⠳⣄⠀⠀⠀⠀ preimage for double rot13!