![]() ![]() Users will perceive loading speeds of 100ms and below as instantaneous. First Input Delay happens between the First Contentful Paint (FCP) and Time to Interactive.Ī good FID score is 100ms and below. The entire duration the user has to wait is what we call the First Input Delay.įirst Input Delay is different from Time to Interactive (TTI) because TTI measures the time until the page is interactive, not the response time of the page to the interaction. If a user interacts with the website while the main thread is still busy, it creates a delay because the main thread needs to finish executing all JavaScript files, especially long tasks, before it could respond to the user’s request. However, that does not mean that the website has fully loaded all of its functionalities. While the main thread is still processing CSS and JS files, some parts of the website may now be visible to the user. When you open a web page, the browser will make a couple of network requests from the website to load necessary files and then process it in the main thread. To fully understand what FID is, let’s have a quick run-through of the loading process of a web page. It is a metric that focuses on the interactivity of a web page which means if a user did not interact with the page, FID is not measured. What is First Input Delay?įirst Input Delay or FID measures the time it takes for a page to respond to a user’s first interaction with it. ![]() If you haven’t read what the Core Web Vitals are yet, I highly recommend that you read the first part of our guide first by going to this link.Īnd if you’re interested to read about Largest Contentful Paint, the first metric in the Core Web Vitals, I highly recommend that you go check out our guide for that as well. In this third part of our Core Web Vitals guide, I will walk you through the second Core Web Vitals metric, First Input Delay (FID). Have you ever experienced trying to click on a button or a link on a website but it doesn’t seem to respond right away? That small delay leaves a bad impression on users that may ultimately be the reason why they don’t visit more pages on your website or worse, not return at all.
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