Official statement
A long task is any task that takes more than 50 milliseconds to complete. If you're experiencing FID issues, reviewing your long tasks is a great starting point. Long tasks are highlighted in Chrome DevTools and can be programmatically accessed via PerformanceObserver.
Other statements from this video 13 ▾
- □ Why is First Input Delay essential for technical SEO?
- □ How do individual URLs truly impact Page Experience and SEO?
- □ How do FID scores from the Chrome UX Report impact your SEO?
- □ How can you access FID data via Search Console to enhance your SEO strategy?
- □ How can PageSpeed Insights transform your SEO strategy?
- □ Why does a URL need to be online for at least a month to be included in the CrUX Report?
- □ Do Core Web Vitals really lack success thresholds?
- □ Is it true that a FID under 100ms can enhance user experience for most visitors?
- □ Is it possible for FID to be non-existent without user engagement?
- □ How can you effectively measure FID on new pages?
- □ How can managing JavaScript effectively boost your FID?
- □ Why should you optimize JavaScript for SEO?
- □ What SEO benefits can you gain by using async and defer attributes on your scripts?
Official statement from
(4 years ago)
⚠ A more recent statement exists on this topic
Why is First Input Delay so challenging to measure in a lab setting?
View statement →
TL;DR
Long tasks can negatively impact First Input Delay (FID). Analyzing and breaking up tasks that exceed 50 ms is essential for boosting web performance. Utilize Chrome DevTools and PerformanceObserver to diagnose and optimize.
❓ Frequently Asked Questions
Pourquoi 50 ms comme seuil ?
C'est le seuil défini par Google pour éviter des problèmes de réactivité perceptibles par les utilisateurs.
Qu'est-ce qu'un PerformanceObserver ?
C'est une interface JavaScript qui aide à observer et collecter des métriques de performance en temps réel.
Les techniques présentées sont-elles suffisantes ?
Elles peuvent être un début, mais ne résolvent pas toujours tous les obstacles de performance pour autant.
🎥 From the same video 13
Other SEO insights extracted from this same Google Search Central video · published on 21/09/2021
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