What Is FID (First Input Delay — legacy metric) in SEO?
Use Cases
Used in SEO audits to gauge delay between user interaction and browser response — affecting rankings and UX.
Helps developers and marketers measure user interaction delays on mobile sites for optimization priority.
Helps diagnose render-blocking scripts causing long input delays and degraded interactivity.
Legacy Data for Historical Analysis
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Frequently Asked Questions
Is FID still a Core Web Vital?
No, FID was officially replaced by the INP (Interaction to Next Paint) metric in 2024 as a more comprehensive measure of responsiveness.
Why is FID important in SEO?
FID impacted user experience metrics that Google takes into account for search rankings — fast responses lead to better rankings.
What causes high FID scores?
Heavy JavaScript execution, long tasks, and render-blocking resources often cause poor FID performance.
How can I check my site’s FID?
Google recommended keeping FID under 100 milliseconds for an optimal user experience.
What's the recommended FID threshold?
While no longer a live Core Web Vital, FID can provide useful historical insight and help inform broader performance improvements.
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