Litespeed Cache is a free caching plugin which works best with a a Litespeed web server, but may work with other web servers also. It has so many options that it can be confusing to setup and configure. I’ve always used WP Johnny’s guide, but I’m not sure how often it is updated. This video is a current walk-through and is easy to follow: https://youtu.be/BxldFybE3yM

Testing LiteSpeed, Apache, and NGINX. LiteSpeed seemed superior.

The LiteSpeed Cache plugin had a security issue that has been patched. Update if you haven’t already.