Test your website speed GTmetrix tells you how your website performs, why it's slow, and how to optimize it.

Core Web Vitals are one of the key signals in Google's search ranking algorithm. A very poor performing website may not fare well in search results and can impact your revenue if fewer …

A collection of web optimization resources, how-tos and guides to help you with front-end performance optimization essentials.

Dec 2, 2021 · The above optimization plugins are a good overall fit for most websites, both in terms of compatibility and improving site performance. If you have a WordPress site, give this …

How does it work? In simple terms optimizing your image works by removing all the unnecessary data that is saved within the image to reduce the file size of the image based on where it is …

Nov 21, 2025 · We discuss some web performance tool alternatives to GTmetrix, and how GTmetrix compares to them.

Test in North America and Europe Check how your page performs in popular global markets.

Mar 16, 2021 · With Google also echoing this belief, mobile testing should be an essential part of your website development and optimization workflow. Check out our guide on testing on …

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 …

Basically, LCP measures how fast substantial content on your web page can be consumed by your visitors. The assumption is that loading the largest content element on your page, like a …