Enable mod_pagespeed for Apache on CentOS
mod_pagespeed by google inc, can help you get 100/100 in google pagespeed. You will not get 100/100 straight out of the box, but with some tweaking we might get near.
I will try to help you getting started with mod_pagespeed for Apache on CentOS 7, you might be able to use this guide with other distros.