You need to install rankmirrors (python script). And run /usr/sbin/rankmirrors against your mirrorlist or its backup to locate nearest and fastest mirrors. Then run pacman -Syy to refresh your dbase. Any changes to /etc/pacman.d/mirrorlist require pacman -Syy.
Also you need to go to https://users.archlinux.de/~gerbra/mirrorcheck.html
to check whether the mirror is properly synced.
Currently the site cannot be reached. Some certificate errors.