Pacman
get the fastest mirror (France for example)
curl -s "https://archlinux.org/mirrorlist/?country=FR&protocol=https&use_mirror_status=on" | sed -e 's/^#Server/Server/' -e '/^#/d' | rankmirrors -n 5 -
set mirror
sudo vim /etc/pacman.d/mirrorlist
resolve untrusted packages when updating
sudo pacman -Sy archlinux-keyring