DirectAdmin PageSpeed install
GitHub - pagespeed/mod_pagespeed: Apache module for rewriting web pages to reduce latency and bandwidth:
https://github.com/pagespeed/mod_pagespeed
GitHub - pagespeed/ngx_pagespeed: Automatic PageSpeed optimization module for Nginx:
https://github.com/pagespeed/ngx_pagespeed
Documentation:
https://www.modpagespeed.com/doc/
Use the Google PageSpeed Module to Dramatically Increase the Speed of Your Website - YouMoz - Moz:
https://moz.com/blog/use-googles-pagespeed-module-to-dramatically-increase-the-speed-of-your-website
How install with nginx:
https://vpsineu.com/blog/install-configure-nginx-pagespeed-module-directadmin-linux-vps/