# First Input Delay

DevFeed: [First Input Delay](<https://devfeed.tech/articles/first-input-delay-29502.md>)

Original publisher: [Read original article](<https://philipwalton.com/articles/first-input-delay/>)

Published: 2018-05-10T19:15:30Z

Content type: article

Language: en

Sources: [Philip Walton](<https://devfeed.tech/sources/philip-walton.md>)

Topics: [Web](<https://devfeed.tech/topics/web.md>), [browser](<https://devfeed.tech/topics/browser.md>), [JavaScript](<https://devfeed.tech/topics/javascript.md>), [Library](<https://devfeed.tech/topics/library.md>)

Tags: [browser](<https://devfeed.tech/tags/browser.md>), [javascript](<https://devfeed.tech/tags/javascript.md>), [library](<https://devfeed.tech/tags/library.md>), [metric](<https://devfeed.tech/tags/metric.md>), [performance](<https://devfeed.tech/tags/performance.md>), [time](<https://devfeed.tech/tags/time.md>), [web](<https://devfeed.tech/tags/web.md>)

## AI overview

The article introduces First Input Delay, a performance metric that measures the time between a user's first interaction with a site and the browser's ability to respond. It also mentions a JavaScript library for measuring the metric.

## Source excerpt

On the web, a good first impression can make the difference between someone becoming a loyal user and them leaving and never coming back. One of the key ways a site shapes our first impression is what happens when we first try to interact with it.