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Instantly test your site’s speed, usability, and resilience in real browsers, devices, and locations around the world.
Online CourseLearn to analyze performance, fix issues, and deliver fast websites from the start.
All of the WebPageTest features you already love, plus API Access & No-Code Experiments!
Chrome-specific advanced settings:
Enter Script (or read it from a text file)
Block Requests Containing (URL substrings)... Space-separated list (type in or read from a text file)
Block Domains (full host names)... Space-separated list of domains (type in or read from a text file)
Simulate failure of specified domains. This is done by re-routing all requests for the domains to blackhole.webpagetest.org which will silently drop all requests.
Hosts to fail (one host per line)... Type in or read from a text file
Custom Metrics: Type in or read from a text file
Virginia - EC2Salt Lake City, Utah - GCECalifornia - EC2Toronto, Canada - EC2Sao Paulo, Brazil - EC2Ireland - EC2London, UK - EC2Paris - EC2Amsterdam, NL - GCEFrankfurt, Germany - EC2Milan, Italy - EC2Stockholm, Sweden - EC2Cape Town, South Africa - EC2Bahrain - EC2Dubai, UAE - AzureMumbai, India - EC2Bangkok, Thailand - TencentSingapore - EC2Jakarta, Indonesia - GCEHong Kong, China - EC2Shanghai, China - TencentBeijing, China - TencentNingxia, China - EC2Taiwan - GCESeoul, Korea - EC2Tokyo, Japan - EC2Osaka, Japan - EC2Sydney, Australia - EC2Melbourne, Australia - AzureLos Angeles, CA - M1 Mac Mini/iOS (Chrome,Firefox,Safari)New York, NY - M1 Mac Mini/iOS (Chrome,Firefox,Safari)New York, NY - Android DevicesDulles, VA - Android Devices
“Experiments are a game changer for quantifying the speed impact of performance optimizations. What took days of technical work is now just a few clicks. Not only will this save tons of time, it will let us test and iterate ideas to find the right mix of recommendations efficiently.I’m blown away this exists, it feels like magic.”
Test your user’s real experience with global locations, modern devices, and the latest browser versions.
Correlate your user’s visual experience to the technical measurements of your site.
Dive into the anatomy of your webpage with components like DNS, TCP, TLS, and more.
Learn why packet-level throttling is better than DevTools throttling and the gold standard in accuracy for WebPerf measurements.
Chris Coyier takes the API out for a spin and shares where he sees the most promise for developers
How to use WebPageTest's render-blocking indicator to improve on one of the most common performance bottlenecks.
