Sans aller jusqu’à ce que toutes les fonctions d’une même entreprise s’ancrent dans la même logique, le fait que les parties prenantes d’un projet soient raccord sur les intentions est une étape importante. Probablement la première à passer.

The deep dive helped our team develop best practices that we are able to apply to our work going forward. It also helped us refine a performance mindset that encourages exploration. As we develop new features, we can apply what we’ve learned while always trying to improve on these techniques.

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.

The open collection of tools and tutorials that helps dealing with complex design challenges.

Pour conclure, les 2 points à retenir à propos de Page Speed Insight qui est un bon outil, mais…

• des résultats sont à relativiser ;
• rien ne remplace l’œil et l’avis d’un.e expert.e pour savoir quelles optimisations appliquer et comment !

Pages Speed Insight propose ainsi un système de notation sévère qui pousse aux optimisations webperf - et c’est une bonne chose ! En effet, s’il ne faut pas le prendre au pied de la lettre (ou du chiffre), il invite malgré tout à réfléchir aux moyens d’améliorer ses temps de chargement.

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.

Heart est un outil open-source et modulaire d’automatisation d’analyses de qualité web. Il met à contribution Mozilla Observatory, Qualys SSL Labs Server et Dareboost pour produire des rapports de qualité Web et les publier sur Slack.

Basé sur PHP Typography de KING­desk, l'outil permet de coller du texte à corriger en termes de microtypo, puis copier la version corrigée.

Besides enriching the lives of millions of persons with disabilities, practicing accessibility proactively protects your brand and bottom line.

Performance metrics are surprisingly challenging to get right.

Browsers don't always behave as we would want or expect them to, but we do have tools at our disposal to steer that behaviour towards the result we want.

Wikipedia reduceds the JS initial payload to fit within a budget of 28 KB. In total, the year-long effort is saving 4.3 Terabytes a day of bandwidth on our users' page views.

This talk looks at our perception of performance, some of the issues and challenges with our current approach to designing and delivering fast experiences.
[…]
How we design, develop and deliver our pages determines our visitor's experience.

To make sure your animations don’t cause performance issues, consider the impact of animating a given CSS property. Avoid layout recalculations and minimize repaints. Where you can, stick to changing transforms and opacity.

So with a little bit of JavaScript, backend code and some thought, it is possible to deliver your website using less data.

Les fonctionnalités sont nombreuses et permettent d’améliorer grandement l’expérience utilisateur. L’impact écologique est moindre, ce qui n’est pas négligeable non plus.

Yes, we need to better prioritize our asset delivery, but most importantly, we need to stop delivering so much JavaScript. We need to audit our script inventory, and scrutinize our 3rd party integrations regularly, as many of these packages are abandoned or meant to be short-lived.