The last couple of weeks saw the addition of three new mirrors, first there was the addition of a French mirror:
Right after that a mirror in the Netherlands was setup for KaOS:
Today a first mirror in South-America is added, located in Brazil:
You can select either one of these new mirrors by merging /etc/pacman.d/mirrorlist.pacnew into /etc/pacman.d/mirrorlist and commenting (place a '#' without the quotes in front of the not wanted Server = line).
Make sure your primary mirror is the first un-commented one. Wait for the pacman-mirrorlist package to hit core before trying to add the Brazilian mirror this way.