While the official threshold is 75% of page loads, Google says that for FID in particular, they “strongly recommend looking at the 95th to 99th percentiles, as those will correspond to the particularly bad first experiences users are having with your site. You can learn more about how Google creates thresholds here. In order to be considered “good,” Google’s threshold should be met 75 percent of the time, segmented across mobile and desktop devices. Google recommends webpages aim for an FID of 100 milliseconds or less*, which means the page would be able to respond to an interactive event within that time frame. It does not measure things like scrolling and zooming, which are related to animation. It analyzes things like clicks, taps and key presses, which fall under the “responsiveness” category. And not all interactions are relevant to FID … How you track, report on, and analyze FID will probably be quite a bit different from other metrics you may be used to.įID measures the first impression of your site’s interactivity and responsiveness. Not all users will interact with your site every time they visit. Keep in mind that FID will not apply to every situation, as Google points out here: Therefore, we believe initially focusing on improving site’s first user interaction will have the greatest impact on improving the overall interactivity of the web. The biggest interactivity issues we see on the web today occur during page load.The first input delay will be the user’s first impression of your site’s responsiveness, and first impressions are critical in shaping our overall impression of a site’s quality and reliability.Google cites two important reasons why the first input delay is important: …įID measures the time from when a user first interacts with a page (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 begin processing event handlers in response to that interaction. That is because this is when most resources are being downloaded, parsed, executed and rendered.įirst Input Delay (FID) is an important, user-centric metric for measuring load responsiveness because it quantifies the experience users feel when trying to interact with unresponsive pages-a low FID helps ensure that the page is usable. While technically this could happen throughout the lifespan of a user session on a webpage, in practice, most interactivity problems occur during initial page load. In this article, part of our series covering the page experience update, I’ll discuss first input delay, or FID:įID measures the responsiveness of a page to user events. The current set of core web vitals includes: Google’s ranking algorithm update called page experience, which Google rolled out from June to August 2021, incorporates core web vitals as NEW ranking factors for SEO. “Core web vitals” is a set of core webpage functionalities that impact user experience.
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