![]() Measuring only one of them would give you an incomplete picture of the actual user experience. That’s why FID and FCP are inherently connected. And as I said, first impressions are crucial.Īlso, user inputs happen after the first piece of content is painted. Together, both metrics give you a great sense of the first impression on your website. One deals with responsiveness and the other - with load time. In other words, FID and FCP measure different things. That could be a picture, video, text, animation, or anything else described in the Document Object Model (DOM). While this is a common question, FCP and FID are two different metrics.įCP measures when the first piece of content is painted. Is First Contentful Paint the same as First Input Delay? I know it’s a bit of an acronym overload but bare with me. So, FID, FCP, TTI, and TBT all work together. However, if you’ve read our article on Total Blocking Time (TBT), you know that TBT also resides in the same area. ![]() The first user interaction usually happens between First Contentful Paint (FCP) and Time To Interactive (TTI). We’ll talk more about the main thread later in this article. And a user clicking on the same button at different times will produce a different result, depending on which tasks are running on the main thread. If there’s no input, there’s nothing to measure. It requires a real user to provide input at a specific time. That’s why keeping a low FID is crucial.įID is also unique in one other way: it’s a field-only metric. Users typically don’t stick around if their first attempt to interact with a page is unsuccessful. Well, first impressions are everything on the web. Now, FID tracks the delay after only the first input. And Google also treats 100ms as the line between good and bad FID. Human perception likely hasn’t changed much since then. “0.1 second is about the limit for having the user feel that the system is reacting instantaneously, meaning that no special feedback is necessary except to display the result” For example, in his 1993 book Usability Engineering Jakob Nielsen points out the following: In general, 100ms is an important threshold for users. To pass the assessment a page’s FID should be less than 100ms for 75% of all page loads. Scrolls and zooms don’t trigger this metric. FID measures the delay after distinct actions like clicks or taps. How main thread blocking time affects FID Īs I said, FID tracks how long it takes for the browser to begin processing the first user interaction on a page. How it fits in with the other page speed metrics What First Input Delay (FID) is and why it’s important However, FID is an important part of understanding the user experience on your site.Īnd as part of Google’s Core Web Vitals, it also affects your site’s organic rankings. This metric is tricky to measure, as it requires real user input. First Input Delay (FID) measures the delay between a user’s first interaction and the moment the browser can respond.
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