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GTmetrix tells you how your website performs, why it's slow, and how to optimize it. Test your page speed, track your performance over time, get alerts, and test on different devices and locations with GTmetrix.
- Overview
- What Does Speed Index Measure?
- Speed Index' Effect on Your Performance Score
- Thresholds For Speed Index
- How to Improve Speed Index?
- GeneratedCaptionsTabForHeroSec
Speed Index (SI) is a performance metric that measures how quickly your page is visually complete above-the-fold. SI is dependent on the size of the browser view port and differs from other metrics like First Contentful Paint (FCP) or Largest Contentful Paint (LCP)because it is not a milestone on your page's loading timeline. Instead, it is the res...
The Speed Index metric is a synthetic timing that is calculated, not measured. It is computed using visual differences between frames captured during your page load. Each visual frame represents time intervals, and each captured frame is scored for visual completenessabove-the-fold until all content is visible i.e., when the page is visually comple...
Speed Index accounts for 10% of the total Performance Score. Effectively, a lower SI indicates that above-the-fold content loaded much earlier, giving your visitors the perception of a faster loading page.
GTmetrix displays the calculated Speed Index in seconds, with a lower time representing a faster loading webpage. SI thresholds are, as follows: 1. Good - nothing to do here= SI of 1311 milliseconds or less. 2. OK, but consider improvement= SI between 1311 and 1711 milliseconds. 3. Longer than recommended= SI between 1711 and 2300 milliseconds. 4. ...
Notethat the particular audits mentioned below likely contribute the most to your SI; however, your page's Speed Index may also be affected by other optimizations that aren't mentioned here. In general, most performance optimizations that result in a faster First Contentful Paint and Largest Contentful Paintare also likely to result in a faster Spe...
Speed Index (SI) measures how quickly your page is visually complete above-the-fold. Learn how SI is calculated, what thresholds are, and how to improve it with GTmetrix tools and audits.
GTmetrix analyzes your website's speed, structure, and web vitals, and helps you improve them with reports, audits, and alerts. Test your page in different locations, scenarios, and connection speeds, and see how it impacts your engagement, conversions, and search ranking.
PageSpeed Insights is a tool that analyzes your web pages and suggests ways to make them faster on all devices. Learn how to use it, what's new, and more on the documentation site.
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