Test. Optimize. Repeat.

Real Experience

Test your user’s real experience with global locations, modern devices, and the latest browser versions.

Video Capture

Correlate your user’s visual experience to the technical measurements of your site.

In-Depth Metrics

Dive into the anatomy of your webpage with components like DNS, TCP, TLS, and more.

“One of the cool features of WebPageTest is that it can generate a filmstrip of screen snapshots taken during a web page load, enabling us to quantify how a page loads, visually. This view makes it significantly easier to determine how long the page is blank for, and how long it takes for the most important content to render.

Being able to look at the results in this way, provides the ability to empathise with the user.”

Andrew Galloni, Engineering Director at Cloudflare

Featured Content

Why First Contentful Paint Doesn't Work As a Cross-Browser Metric

Learn why First Contentful Paint isn't exactly apples-to-apples from one browser to the next

WebPageTest API Review on CSS Tricks

Chris Coyier takes the API out for a spin and shares where he sees the most promise for developers

Extending WebPageTest With Custom Metrics

Check out a few examples of powerful custom metrics you can pull from WebPageTest