While a good TTFB doesn’t necessarily mean you will have a fast website, a bad TTFB almost certainly guarantees a slow one.

… la webperf, c’est avant tout de l’UX qui consiste à offrir une expérience de navigation fluide & rapide, afin de faciliter la consultation et l’achat de vos produits/services.

Il serait peut-être temps de se rappeler pourquoi donner trop de pouvoir à l’État est dangereux, pourquoi c’est au citoyen de contrôler son État et pas l’opposé, pourquoi la vie privée et le secret des correspondances sont essentiels à la vie démocratique.

We’ll discover why front-end performance matters, how to measure your web application performance, and what tools you should use to collect these relevant metrics.

stale-while-revalidate helps developers balance between immediacy —loading cached content right away— and freshness —ensuring updates to the cached content are used in the future.

Total Blocking Time is a companion metric to Time to Interactive. For each task, it considers all time except for the first 50ms to be "blocking time". Total Blocking Time is, then, the sum of all the blocking time that fall between FCP and TTI.

Accessibility is a holistic practice, essential to some but useful to all. It is a practice that touches on many aspects of good web design and development, especially performance. This talk will highlight opportunities and techniques to improve your website or web app’s performance by embracing an accessible, inclusive mindset.

Have you ever been reading an article online when something suddenly changes on the page? Without warning, the text moves, and you've lost your place.

If you're using a web font, you're bound to see a flash of unstyled text (or FOUC), between the initial render of your websafe font and the webfont that you've chosen. This usually results in a jarring shift in layout, due to sizing discrepancies between the two fonts. To minimize this discrepancy, you can try to match the fallback font and the intended webfont’s x-heights and widths [1]. This tool helps you do exactly that.

Le travail qui nous attend est énorme. Les changements d’habitude peuvent paraître insurmontables (j’ai passé une semaine chez mes parents, produits des Trente Glorieuses, je saisis pleinement l’ampleur du travail), mais on n’a pas vraiment le choix.

"Eyes don't lie: understanding users' first impressions on website design using eye tracking"

À la question « Combien coûte un site web ? », répondre par un chiffre n’a pas de sens. Pour estimer le coût d’un site web, la solution consister à lister les éléments nécessaires à la conception et à la vie d’un site.

Configuring TLS is perhaps the most complicated and error-prone of all IT tasks, and this tries to make it as easy as possible.

To make this risk-score system work accurately, website administrators are supposed to embed reCaptcha v3 code on all of the pages of their website, not just on forms or log-in pages. Then, reCaptcha learns over time how their website’s users typically act, helping the machine learning algorithm underlying it to generate more accurate risk scores. Because reCaptcha v3 is likely to be on every page of a website,  if you’re signed into your Google account there’s a chance Google is getting data about every single webpage you go to that is embedded with reCaptcha v3—and there many be no visual indication on the site that it’s happening, beyond a small reCaptcha logo hidden in the corner.

Just is a build task definition library. Tasks can be composed, executed in series and in parallel. Logging, command-line arguments, conditionnals, a very simple API…

Google Fonts are easy to implement, but they can have a big impact on your page load times. Let’s explore how we can load them in the most optimal way.

A visual way to understand CSS specificity. Change the selectors or paste in your own.

In this talk, we’ll take a look at unruly or uninvited (third-)party guests: how to detect them, how to audit them, and how to manage them. We’ll also look at the different tools available to help us stress-test and quantify the overhead these third parties bring, and what that means for users and businesses alike.

There is a clear pattern of environmental properties having the worst correlation: Effective connection type, device memory, available CPU, page transfer size. This might suggest that users are aware of their device, network quality and page size (small vs big article in Wikipedia's case) and adjust their expectations to those factors.

Our current generation of frameworks makes off-main-thread architectures hard and diminishes its returns. UI frameworks are supposed to do UI work and therefore have the right to run on the UI thread. In reality, however, the work they are doing is a mixture of UI work and other related, but ultimately non-UI work.