Wordpress Plugins
https://dev.to/davo20019/how-to-get-100-100-on-google-pagespeed-insight…
Database Cleanup
https://wordpress.org/plugins/search/database+cleanup/
Server Side Cache
Memcached: https://websiteforstudents.com/install-memcached-with-apache-on-ubuntu-… + guide: https://www.cloudways.com/blog/wordpress-memcached/
Redis VS Memcached: https://www.youtube.com/watch?v=j_mjvkhZG18