GTmetrix is a free tool to test and monitor your page's performance. Using Lighthouse, GTmetrix generates scores for your pages and offers actionable recommendations on how to optimize …

Using data from Chrome User Experience Report (CrUX), you can see exactly how real users experience your page load. Get metrics on real user experiences from visitors (LCP, INP, CLS …

Read this article to understand the entire list of elements considered for LCP. GTmetrix measures how quickly the largest above-the-fold content element is painted onto your page. Websites …

We show you how to use presets for convenient one-click analysis. We've written more guides specific to PRO-only features, which are useful for more advanced testing and analysis under …

WP Rocket applies 80% of web performance best practices right out of the box, which allows your pages to load and render faster visually and directly improve your Speed Index score.

The GTmetrix Grade blends how fast your page performs (in terms of loading, interactivity, and visual stability) with how well it’s built for optimal performance.

GTmetrix uses a real browser to load your page in its entirety, and then audits the data using Google Lighthouse. A report is generated containing performance data, insights, and …

Nov 21, 2025 · Provides both mobile and desktop analysis with separate thresholds for good, bad, and needs improvement metrics. This is available for both lab (synthetic) and field data.

Simply put, CLS measures the unexpected shifting of web elements while the page is being rendered. This measurement is then quantified as an aggregate score of all the individual …

GTmetrix reports the total DOM elements for a page, the page's maximum DOM depth, and its maximum child elements. Depending on the DOM size (i.e. number of DOM elements), this …