Official statement
Non-essential code for page loading should use the async or defer attributes on the script tag. Defer indicates that the script will not change the layout and will not block rendering. Async goes further by not blocking on any other script.
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?
- □ Are You Splitting Your Tasks to Enhance FID?
Official statement from
(5 years ago)
⚠ A more recent statement exists on this topic
Should you use async and defer to optimize your SEO scripts?
View statement →
TL;DR
Use async or defer attributes for your non-critical scripts. Defer does not block page rendering, and async prevents waiting on other scripts. This improves loading speed and enhances user experience.
❓ Frequently Asked Questions
En quoi defer diffère-t-il d'async ?
Defer ne bloque pas le rendu HTML et exécute les scripts après le chargement. Async ne tient pas compte de l'ordre des scripts.
Tous les scripts peuvent-ils utiliser async ou defer ?
Non. Seuls les scripts non essentiels ne modifiant pas la mise en page peuvent bénéficier de ces attributs.
Ces optimisations ont-elles un impact réel sur SEO ?
Oui, elles peuvent améliorer la vitesse de chargement, ce qui est apprécié par les moteurs de recherche et les utilisateurs.
🎥 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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