[kelvie]

One of the reasons I switched to arch from debian based distros was precisely how much faster pacman was compared to APT -- system updates shouldn't take over half an hour when I have a (multi)gigabit connection and an SSD.

It was mostly precipitated by when containers came in and I was honestly shocked at how fast apk installs packages on alpine compared to my Ubuntu boxes (using apt)

[akdev1l]

pacman is faster simply because it does less things and it supports less use cases.

For example pacman does not need to validate the system for partial upgrades because those are unsupported on Arch and if the system is borked then it’s yours to fix.

[pxc]

Less charitably, pacman is fast because it's wrong. The dependency resolver is wrong; it fails to find correct answers to dependency resolution problems even when correct answers are available.