How to pass the Google Page Speed - Overall Score Test?
The PageSpeed Modules are the open-source Apache HTTP Server or Nginx web server modules, which automatically apply chosen filters to pages and associated assets, such as stylesheets, JavaScript, and HTML files, as well as to images and website cache requirements. These modules do not require modifications to existing content or workflow,[8] meaning that all internal optimizations and changes to files are made on the server side, presenting modified files directly to the user. Each of the 40+ filters corresponds to one of Google's web performance best practices rules.