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Provide instrumentation to support ResourceLoader improvements
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Description

For the current work on optimization ResourceLoader to be successful, we should be able to assess the impact of proposed changes on a number of key metrics, such as first paint time, and also be able to compare waterfall graphs of page loads with the relevant change applied and without it. This data should be collected and archived automatically, using multiple browsers and multiple pages (representative of real traffic).

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ori assigned this task to Peter.Hedenskog.
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Krinkle triaged this task as High priority.Jul 19 2015, 7:02 PM
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compare waterfall graphs of page loads with the relevant change applied and without it

Even before deployment? That would be complicated.
There are many talking about https://github.com/marcelduran/webpagetest-api but I saw little from open source projects, it will be interesting.