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What is the First Input Delay (FID)?


What is the First Input Delay (FID)?

First Input Delay (FID) is important and user-centric metric, which evaluates load responsiveness, which quantifies the perception of users when they try to interact with your website and it is still not responding; a low FID helps to ensure that the website has a correct user experience. What is the First Input Delay (FID)?, What is FID?, What is a good FID score? Why is the FID so important on your website? First Input Delay (FID)?

FID, like the CLS and LCP, is another Google metric included in the Core Web Vitals, which focuses on the user experience on each of the websites that the Google Search Engine positions.

What is FID?

FID measures the time from the first time a user interacts with the page, that is, when they click on a link, a button or some action with JavaScript, until the moment when the browser processes the events in response to that interaction.

What is a good FID score?

To provide a good user experience, websites should strive to have an FID score of 100 milliseconds or less, normally static websites. The lower your score, the more stable your design will be.

What is the First Input Delay (FID)?
What is the First Input Delay (FID)?

The official FID scores used by Google's performance tools are as follows:

  • Good - FID below 100 milliseconds.
  • Improvable - FID between 100 and 300 milliseconds.
  • Needs Improvement - FID above 300 milliseconds.
  • Google recommends that you keep the CLS score below 100 milliseconds to provide a good user experience.
  • To measure the FID of your website, you have the following Google tools:
  • Google Page Speed
  • Chrome user experience Report

Why is the FID so important on your website?

Just like in real life, making a good first impression is important. With your website, it should not be less, a good first impression can make the difference between a user who ends up being a customer or who leaves and never returns. So what can we do to make a good impression?

On the web, first impressions can be different perspectives, from design to user experience, but perhaps the most important thing is speed and responsiveness.

Evaluating tastes such as design becomes practically impossible, design is a perception influenced by culture, gender, age, among many others. So in order to evaluate and improve this first impression, focus on measuring speed and responsiveness.

The first impression a user has of the speed with which your website loads can be measured with First Contentful Paint (FCP). The First Input Delay (FID) metric helps measure your user's first impression based on the interactivity and responsiveness of your website.


Like the rest of Core Web Vitals , FID focuses on improving the user experience. The FID metric evaluates the processing time of the events that the user executes on the website. Once the user clicks a link or button, FID begins to evaluate the response time to that interaction.


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