What is First Input Delay (FID)?

What is First Input Delay (FID)?

First Input Delay (FID) measures the time is takes in the page load process at which users are able to interact with the webpage.

First Input Delay is one of the main Core Web Vitals that allow developers to benchmark how quickly a page is perceived to load for users.

What is a good First Input Delay score?

As per the diagram below, a good First Input Delay score should be 100ms or below.

Above 100ms is classed as 'needs improvement' up to 300ms+ which is 'poor'.

First Input Delay

Does First Input Delay affect SEO?

Yes, FID is one of the main Core Web Vitals which are now part of the user experience algorithm as a ranking factor in Google.

This means that if you improve your FID/Core Web Vitals you will help contribute towards achieving higher rankings in Google.

What are the other Core Web Vitals?

As well as First Input Delay, Largest Contentful Paint and Cumulative Layout Shift are the other two primary Core Web Vitals.

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