Found 2 books

Using WebPageTest · Web Performance Testing for Novices and Power Users

[en] Using WebPageTest · Web Performance Testing for Novices and Power Users O'Reilly Media

Viscomi, Rick & Davies, Andy & Duran, Marcel

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Using WebPagetest

[en] Using WebPagetest O'Reilly Media

Rick Viscomi, Andy Davies & Duran, Marcel

download read it!