The site relies heavily on client-side rendering.Ī large difference between FCP and LCP indicates that the LCP resource is either Must complete a lot of work to render any meaningful content, suggesting that The appearance of the initial content is measured by FCP, and theĭifference between FCP and other metrics can be very telling.Ī large difference between TTFB and FCP might indicate that the browser needs toĭownload a lot of render-blocking assets. Once a page starts rendering, there might be an initial paint (for example, theīackground color), followed by some content appearing (for example, the site Inability to use cached content due to query parameters. High TTFB can make achieving a 2.5 second LCP challenging or even impossible.Ī high TTFB can be caused by multiple server redirects, visitors located farįrom the nearest site server, visitors on poor network conditions, or an TTFB is the time from the visitor starting to navigate to a page (for example,Ĭlicking a link), until the first bytes of the HTML document are received. Metrics that can provide valuable insights into LCP. Time to First Byte (TTFB) timings, which are good diagnostic Supplementary metricsĭevelopers working on optimizing LCP can also use the Similarly, it can show which device types have LCP issues. Whether an LCP issue is specific to this page, or a more general site-wide Looking at the four different categories of CrUX data can help you understand Without any cached content, making them the slowest pages on a website. Home pages tend to be visited by new users and are therefore often loaded It can also be affected by how visitors navigate to these pages. LCP, depending on how the LCP is loaded on that page compared to other pages on The LCP for the whole origin might be very different to an individual page's When PageSpeed Insights doesn't have URL-level data, it shows If a URL doesn't have enough data to be shown at the URL level, butĭoes have data for the origin, PageSpeed Insights always shows the origin data. You can toggle these in the controls at the top and top right-hand side of this PageSpeed Insights shows up to four different CrUX data sets: Than CrUX can expose as a public dataset. Using JavaScript APIs running on the page. Traffic to get page-level data), you can supplement CrUX with RUM data collected Where CrUX doesn't provide data (for example, for a page with insufficient Lab-based data is available in the Diagnose performance issues section.Īlways focus on the CrUX data first if it's available. The Discover what your real users are experiencing section. PageSpeed Insights provides access to CrUX data in Which collects anonymous data from real Chrome users for millions of websites. Tools installed on a site, or through the You can surface LCP data based on real users from Real User Monitoring (RUM) Representative of what your users experience. Help you improve your metrics, but lab tests alone aren't entirely These lab-based tools can give a wealth of information to explain LCP and Users are experiencing, rather than only what a lab-based tool like To understand real users' LCP experience, you must understand what real Understand your LCP metricīefore optimizing LCP, developers must understand whether their site has an LCPĪ number of tools can measure LCP, but not all of them measure it in the same Loading process and make sure every step along the way is optimized. To improve LCP you have to look at the entire It's rare that a quick fix to a single part of a page will result in a Web page, and delays across any of them can have a significant impact on LCP. A good LCP value is 2.5 seconds or less.Ī number of factors can affect how quickly the browser can load and render a To provide a good user experience, sites must have an LCP of 2.5 seconds or The user initiates loading the page until the largest image or text block is Quickly the main content of a web page loads, specifically, the time from when Largest Contentful Paint (LCP) is one of the threeĬore Web Vitals metrics.
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