GTmetrix | Updates and web performance insights

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Blog

Upcoming GTmetrix Test Server Changes

Changes / April 7, 2025

We’re making some important changes to our global test servers.

Updated to Lighthouse 12.3, New CLS Audit Details, and Scoring Changes

Changes / March 5, 2025

Moving from Lighthouse 11.0.0 to 12.3.0 saw some relevant changes to CLS scoring methodology as well as various audits.

What is CrUX and Why Should I Care?

Optimization Explained / January 27, 2025

We explain what CrUX data is and why any website owner should care about it.

How to View CrUX Data on GTmetrix

Using GTmetrix / January 27, 2025

In this guide, we show you how to view and interpret CrUX data in the GTmetrix Report.

Field/CrUX Data is Now Available in GTmetrix

Changes / January 27, 2025

We’ve brought field data (CrUX) into the GTmetrix Report in this release!