If you're like me and you made the terrible decision of buying a laptop with 8GB of memory then this is for you. Install zswap. Heavily inspired (stolen) from Peter Roberts article.
First, grab the systemd package for using and configuring zswap
sudo pacman -S systemd-swap
Enable 300% compression over the default 200%
sudo sh -c 'echo -n zswap_zpool=z3fold > /etc/systemd/swap.conf.d/zswap.conf'
Enable the service at boot and start it immediately
sudo systemctl enable --now systemd-swap
Check that the settings have applied correctly, see this article for more.
sudo grep -R . /sys/module/zswap/parameters
Check what zswap is doing with your memory
sudo grep -R . /sys/kernel/debug/zswap