Real users will often have a much faster connection. ![]() However the simulated data shown by PageSpeed Insights incorrectly suggests that the LCP only happened much later.Īlso keep in mind that the lab test assumes a very slow network with a bandwidth of just 1.6 Mbps. ![]() You can use the site speed Chrome extension to view the original data collected in Chrome.įor example, in this result the original “observed” data shows that the First Contentful Paint and the Largest Contentful Paint happened at the same time. Running a simulation instead of collecting real data can introduce inaccuracies. But after running the test Google simulates how the page might have loaded on a slower connection. That means data is collected quickly on a fast connection, so that running the test doesn’t take too long. Lab data is controlled in a controlled lab environment by loading your website from a Google server.Ī big factor here is that Google uses something called simulated throttling. The lab data in PageSpeed Insights is generally less reliable than the field data. If you're not able to replicate performance issues on a page it may just be that this particular URL isn't affected by the issue. ![]() Falling back to aggregate data for all user experiences on this origin. There is insufficient real-user data for this URL. In those case PageSpeed Insights will show this message: Not all pages on the internet get enough traffic for Google to provide page speed data. You should start to see improvements after a few weeks. Google aggregates data over the last 28 days, so if you’ve recently optimized your website the field data may no longer be accurate. So if your Largest Contentful Paint (LCP) is reported as 3 seconds then that means that 75% of users had an LCP below 3 seconds and 25% had an LCP that took more than 3 seconds. Keep in mind that the primary number reported by Google is the 75th percentile of experience. It is also unclear how data from many users is aggregated, and whether a small subset of users who are very active could skew the overall metrics. In some cases it may not paint a full picture, for example if you have a health-related website where many users use Chrome’s Incognito Mode. While this does not cover all user experiences, the field data in PageSpeed Insights is pretty accurate overall. Have opted into usage statistics reporting.Use Chrome on desktop or Android (no data is collected on iOS).The real user data in Google PSI is collected from Chrome users who: Google does also not run tests on a slow device but rather runs a simulation of how a page might have loaded on a slower connection, which can be inaccurate. However, the lab data can sometimes be quite misleading, due to the network settings used to collect data. However, it also excludes some experiences, for example those of Firefox users or Chrome users on iOS. The real user data is generally quite reliable – it tells you about real experiences that a subset of your users have had. To answer this question we need to look at the real user and the lab data separately. When running a speed test on PSI Google automatically tests your site on desktop and mobile devices. In addition to testing performance Lighthouse also assesses SEO, accessibility, and general website best practices. The lab data is based on the free open-source Lighthouse tool. ![]() The real user data is collected as part of the Chrome User Experience Report (CrUX). PSI reports both field data from real users and lab data collected on Google servers. Website performance impacts user experience and is a Google ranking factor. PageSpeed Insights (PSI) is a free tool by Google that measures the loading time of your website. This article will look at how reliable PageSpeed Insights data is and what role it plays for SEO. It automatically analyses your website, focusing on page load time. PageSpeed Insights is a free tool that Google offers to website operators.
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