Speed
From Freephile Wiki
On the web, it's all about speed.
Google has some interesting products as well as good information about speed optimization. See https://developers.google.com/speed/docs/insights/about
See Mozilla's Firefox Developer Tools. or Chrome Dev Tools
Use Apache Bench for local testing and establishing a baseline before tweaking anything on the server.
Not directly related, but there is also https://www.browserling.com/ for testing different browsers.
