Official statement
To enhance the First Input Delay, use the performance profiler to identify what is blocking the main thread. Massive DOM manipulations, layout recalculations, and heavy JavaScript are often culprits. Utilizing Web Workers can aid in moving processing off the main thread.
Other statements from this video 14 ▾
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- □ Why does Google ignore certain resources during a crawl?
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- □ How do blocked API requests impact your SEO?
- □ How can you effectively diagnose JavaScript rendering issues in SEO?
- □ Why is First Input Delay so challenging to measure in a lab setting?
Official statement from
(5 years ago)
⚠ A more recent statement exists on this topic
Why can't Lighthouse actually measure how responsive your site really is to user...
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TL;DR
Google recommends using the performance profiler to identify bottlenecks on the main thread. Heavy DOM manipulations, layout recalculations, and heavy JavaScript are often responsible. Web Workers can help offload the main thread.
❓ Frequently Asked Questions
Qu'est-ce qu'un Web Worker ?
Un Web Worker permet d'exécuter du JavaScript en arrière-plan, séparément du thread principal.
Comment utiliser le profiler de performance ?
Ouvrez l'onglet 'Performance' dans les outils de développement et enregistrez une session de votre site pour analyser les goulots d'étranglement.
Le JavaScript lourd affecte-t-il uniquement le FID ?
Non, il affecte aussi d'autres performances comme le LCP et le TTI, mais le FID est principalement concerné.
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