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O'Reilly has published "Using WebPageTest"

Written by some long-time users of WebPageTest, it begins with the basics of running tests and interpreting the results, before moving on to using the API and installing your own private instance.

The full list of contents is available from O'Reilly
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Tim Kadlec created a grunt task for integrating performance testing and budgeting into your Grunt.js workflows.
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Manning has published "HTTP/2 in Action" by Barry Pollard

HTTP/2 in Action teaches you everything you need to know to use HTTP/2 effectively and how to optimize web performance for your site. Using tools like WebPagetest, this practical guide explores real world examples allowing you to get most out of this recent performance upgrade to the web.

The full list of contents is available from Manning and WebPagetest users get 40% off with the discount code webpagetest40%.
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Make sure your charset is defined at the top of your head or in HTTP headers, otherwise IE may have to restart page parsing (resulting in canceled requests).

More: MSDN Blog - Best Practice: Get your HEAD in order
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ImageOptim You can make your images download faster, without sacrificing quality. Use a lossless optimizer such as ImageOptim or FileOptimizer.
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MozJPEG is a modern JPEG compressor that encodes JPEG images with higher quality and smaller file sizes than a typical encoder. Read introduction to MozJPEG at Performance Calendar.

MozJPEG is meant to be compiled as a drop-in replacement of the libjpeg library. It's also built into ImageOptim and you can try it via a web interface.

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Marcel Duran created a command-line wrapper for the WebPagetest API that can be used to test performance in your continuous integration pipeline (TAP, Jenkins, Travis-CI, etc).
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You care about web performance. Want to learn how to improve your performance from the experts?

#PerfMatters Conference is the web performance conference taking place on April 2 & 3, in Redwood City, California with talks by internationally renowned performance developers. Our focus is on front-end web performance. Register Now!

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Nik Molnar recorded a Pluralsight course called WebPageTest Deep Dive which covers everything from executing simple tests and analyzing their results, to scripting, custom metrics and hosting your own private instance of WebPageTest. Not a Pluralsight subscriber? You can watch any of Nik's courses with the free ten day trial.
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With pngquant you can convert large, transparent 24-bit PNG files to a format that is 4 times smaller, and supports alpha transparency in all browsers.
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Patrick Meenan published his "WebPagetest Power Users" Velocity conference talk to YouTube (Part 1 and Part 2).
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HTTPS has a lot of opportunity for tuning on the server side that can significantly impact the speed at which your content is delivered.

Ilya Grigorik collected the current best practices on istlsfastyet.com and has published his excellent Velocity Conference talk on the topic to YouTube.
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If you instrument your pages to measure the user experience points that you care about most you will get MUCH more actionable results and can measure the performance from your actual users in the field.

More details are available here.
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Google has published a bunch of best practices for web development including information on delivering a fast user experience.
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