Using FastCGI cache allows you to speed up your website up to 1000x. In fact, the FastCGI cache (or Varnish) mechanism consists of putting a server-caching mechanism between a client and your web server. The whole page will be cached as an HTML output, and it will be delivered instead of using the PHP/MySQL/Redis stack, etc. for all users, but only for the first visit (and others after some specified time).
WARNING: This is not a take-away how-to. Please read it carefully and use it at your own risk.
This config is based on the ploi.io stack. We will not cover the FastCGI installation process, so please prepare FastCGI and adapt the next config if you need it.