ngxpagespeed and its apache brother mod_pagespeed are absolutely incredible tools for improving performances of any website. It automates lots of work that used to have to be coded manually in your application, and moves the responsibility to the webserver. It, in the end, allows you with a dead simple configuration file, to minify, shard, optimize, and make many other performance optimization, without you ever worrying about implementing those yourself.
> Either Google is for advertisers or it is for users.
What does that have to do with ngxpagespeed?