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WebPageTest. The gold standard in web performance testing.
Lightning-Fast Web Performance
Online CourseLearn to analyze performance, fix issues, and deliver fast websites from the start.
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Introducing Carbon Control Experimental
New in WebPageTest! Measure your site's carbon footprint and run No-Code Experiments to find ways to improve.
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All of the WebPageTest features you already love, plus API Access & No-Code Experiments!
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“The best professional web performance investigators I know use WPT as a critical part of their workflows, and it's the center or mine.”
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.