And there you have it, a way to change the font-display settings of a page when using WebPageTest. No need to manually update the code to see what effect the property has on a pages perceived performance.

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?

So I often find myself looking at WebPageTest (WPT) waterfall charts, but as I seem to have the memory of a chimpanzee (not a goldfish, that’s a myth) I tend to forget some of the details and what they all mean. So I decided to pull together many bits of information into a single blog post I can then refer to at a later date.

NodeJS CLI Wrapper for WebPageTest API

Etude de cas Mappy pour la Web Perf.