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 them.

"I use this tool almost every day, GTmetrix is now my 1st choice of all speed testing tools." — Torikul, Freelance Developer

Learn how to keep track of your site performance over time and extract more value from GTmetrix. The following guides will guide you on setting up monitoring, configuring Alerts, utilizing History Graphs, …

GTmetrix displays the calculated Speed Index in seconds, with a lower time representing a faster loading webpage. SI thresholds are, as follows: Good - nothing to do here = SI of 1311 milliseconds …

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 them.

"If a metric has gone above a certain threshold, we can get an alert so we can be proactive for our clients — GTmetrix helps us find performance problems before Google notices!"

GTmetrix offers detailed explanation of best practice speed optimizations as well as our own recommendations.

Customize a GTmetrix PRO plan to suit your organization's performance needs. Highest test queue priority, Priority support, White-label PDF Reports, Manual invoice/PO processing and more.

With Lighthouse as the foundation, a new algorithm for GTmetrix scoring was created, introducing a new GTmetrix Grade, alongside new Performance and Structure scores.

The scoring system used in the GTmetrix Report is loosely based on the Lighthouse scoring system. However, it has been augmented by our own expertise and proprietary formulas to deliver a unique …