WebPerf PageSpeed Experimenting with First Input Delay in the Chrome UX Report

eva2000 · Jul 11, 2018

Google have a new article and video on Experimenting with First Input Delay in the Chrome UX Report

The goal of the Chrome User Experience Report is to help the web community understand the distribution and evolution of real user performance. To date, our focus has been on paint and page load metrics like First Contentful Paint (FCP) and Onload (OL), which have helped us understand how websites visually perform for users. Starting with the June 2018 release, we’re experimenting with a new user-centric metric that focuses on the interactivity of web pages: First Input Delay (FID). This new metric will enable us to better understand how responsive websites are to user input.
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How FID is measured
So what exactly is FID? Here’s how it’s defined in the First Input Delay announcement blog post:

First Input Delay (FID) measures the time from when a user first interacts with your site (i.e. when they click a link, tap on a button, or use a custom, JavaScript-powered control) to the time when the browser is actually able to respond to that interaction.
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WebPerf PageSpeed Experimenting with First Input Delay in the Chrome UX Report

eva2000 Administrator Staff Member

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