February 2026
Intermediate to advanced
256 pages
8h 51m
French
Content preview from Ingénierie des performances web à l'ère de l'IA (French Edition)
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Chapitre 2. Mesurer ce qui compte : les indicateurs essentiels pour des performances centrées sur l'utilisateur
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En 2020, Google a lancé une initiative importante pour résumer les performances web en quelques indicateurs clés sur lesquels tout le monde devrait se concentrer : les Core Web Vitals (CWV). Ce chapitre examine en détail chacun des CWV et explique pourquoi ils sont importants. Ayant participé à cette initiative, je te donne un aperçu des coulisses sur la façon dont on a défini ces indicateurs et les raisons qui ont motivé leurs objectifs spécifiques.
Je vais structurer ce chapitre en discutant de chaque indicateur tour à tour, en expliquant ce qu'il mesure, comment l'interpréter et quels sont les objectifs recommandés (bon, à améliorer et mauvais). Je vais surtout relier chaque indicateur au résultat UX qu'il représente et présenter certaines des recherches (« la science derrière les Web Vitals ») qui montrent pourquoi c'est important. Ce chapitre donne un aperçu des indicateurs clés, mais sans trop entrer dans les détails : pour plus d'infos sur comment optimiser ces indicateurs, va voir le chapitre 6.
Les trois premiers CWV étaient le plus grand contenu peint (LCP), le premier délai d'entrée (FID) et le décalage cumulatif de la mise en page (CLS). Le FID a ensuite été remplacé par l'interaction jusqu'au prochain affichage (INP). Chaque ...
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