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Test. Experiment. Improve!

WebPageTest. The gold standard in web performance testing.

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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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Start a Lighthouse Test!

Run Lighthouse on an emulated mobile device on a 3G network. Running the test will give you the top level scores for all the categories Lighthouse runs on, as well as individual level reports.