Gtmegtrix is a web page speed analysis tool. The application looks for opportunities to optimize website performance and provides recommendations for fixing slow pages.
One of the performance indicators is an index that measures the speed at which your page is visually completed on different platforms and provides detailed reports to correct problems on your web pages. Your site's latency score is determined by simulating page loads on different browsers, and considering how this affects the load time of your web pages.
GTmetrix contains a performance report that gives you information on:
Speed index – the time required for the content of the page to become visible
Time to Interactive – to measure response to load
First contentful paint – to measure the time required for site visitors to view the content (text, images, video)
This information can be used to understand which key aspects of the user experience can be improved to increase conversions from your site traffic.