WebPageTest is an online tool and an Open Source project to help developers audit the performance of their websites. […] But things can get difficult pretty quickly when dealing with Single Page Applications […] How can you get through a log in page? How can you test the performance of your users’ flow, when most of it happens client-side and does not have a specific URL to point to?

How to keep up on web performance? The world of web development changes rapidly and measuring and optimizing performance is no exception. We are often presented with new tools, APIs and techniques for building websites that load fast.

A comprehensive and documented article on images on the web, their use and optimization.