All times are on Central European Time (CET).

Conférences de We Love Speed 2019, le 20 septembre
Time Talk
08:30 Attendees’ welcome
09:00 Conference Opening

Eventually: how to measure web performance?

in French by Jean-Pierre VincentTalk

The page loading time is (very often) silly. Other generic and much better metrics exist but each have their weaknesses (speedIndex, first contentful paint, Time to Interactive …). So, I’m going to teach you how to measure what really counts…


Lightning fast UX: faking performance when there’s no code left to optimize

in French by Stéphanie WalterTalk

You have optimized every line of code of your site / mobile application, used all the techniques at your disposal to have the fastest loading time possible. I bet you also don’t have an Instagram or Pinterest’s budget, right? Let’s…

10:30 Coffee Break (30 min)
11:00 Conferences resume

CSS rendering performance

in French by Thomas ZillioxTalk

Fluid animations is sometimes difficult to obtain. We will see together how a browser works and why we have to be careful with SVGs, some units, and most CSS properties. This does not mean that we are deprived of possibilities….


Web Performance as a Core Value

in French by Aniss BoumriguaTalk

Some company are still hesitating to invest a lot of time and money into Web Performance because the matter is highly technical and the gains are neither obvious nor guaranteed. Let me show you how how the "Rue Du Commerce"…


Organizing Business for Web Performance

in French by Dimitri Baeli, Vincent Robert, Francois Boury, Aurélien LajoieTalk

Building a Web performance culture in the workplace is not easy. Managers must imagine how projects are organized (transversal or specialized teams, champions, etc.), define budgets, make their teams adhere to new values by using various motivational leverage. Several French…

12:40 Launch Break (1 hour)
13:40 Conferences resume

How much is 100ms?

in French by Stéphane RiosTalk

Fighting against milliseconds, megabytes or dozens of tags is what webperf addicts do every day and it is obviously a necessity for our beloved Internet users. But the reason that we all work in this ecosystem, is that Amazon has…


User Experience & Performance: Metrics that Matter

in French by Damien JubeauTalk

I’ll talk about a key concept for building a real performance culture for your web projects: the performance budgets. It’s a kind of budget that isn’t expressed in dollars nor euros, but in seconds, megabytes or even in number of…


Chrome UX Report

by Rick ViscomiTalk

Understanding how fast your website is as experienced by real users is a critical first step to begin to optimize performance. But there has been a blind spot in our performance toolbox. Until recently, there hasn’t been a way to…


Optimize performance by selecting optimal dimensions of responsive images

in French by Nicolas HoizeyTalk

The use of recent standards for responsive images (mainly `srcset-w`) has become unavoidable, but is not always accompanied by a fundamental reflection on their proper use. To be more specific, too many sites use arbitrary image sizes in their `srcset-w`s,…

15:40 Coffee Break (30 min)
16:10 Conferences resume

User Experience & Performance: Metrics that Matter

by Philip TellisTalk

Whenever we speak about measuring web performance and user experience, we typically refer to static events in the browsing experience. Modern websites, however, are far from static, and user interactions with these websites have continuous aspects that cannot be represented…


Fast By Default — rebuilding Algolia’s website

by Jonas BadalicTalk

Avoiding the common mistakes and hidden bottlenecks that hinder your site from going fast on all devices and different network conditions by considering multiple options and choosing the one that works best for you. Best practices and common tips do…