https://www.youtube.com/watch?v=kqZg0zGe0Jk

https://onlinemediamasters.com/w3-total-cache-settings/

Install:

apt install memcached libmemcached-tools php-memcached

Increase memory cap to 2GB:

vim /etc/memcached.conf

-m 2048

Restart services:

systemctl restart memcached
systemctl restart apache2

View cached items:

memcdump --servers=localhost