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Debugging with WebPageTest

It's important to establish habits of testing and performance before, during, and after migrating to Fastly. This allows you to clearly measure the impact of tests and changes to your infrastructure.

One tool that Fastly recommends for this purpose is WebPageTest.org. WebPageTest provides a free and open source testing tool for deep performance analysis. It is built on browser technology to accurately replicate what your end users encounter when visiting a website.

We recommend using the WebPageTest defaults for basic testing, but keep a few rules in mind: