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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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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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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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This is a difficult time for diverse communities all around the world and a possible turning point in history for making progress on social justice reform.

As individuals, regardless of where in the world you live, there are ways that you can help, both financially and through direct action. For local progress, one of the strongest ways to improve things is to call your elected officials and push for change directly (particularly within the US where constituent sentiment can directly impact reform).

Here are some resources to help get you started:

Globally:

US:

FR:

If you have additional resources that would be helpful to WebPageTest visitors, please submit a pull request on GitHub here.

Did you know...
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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Manning has published "Web Performance in Action" by Jeremy Wagner

Web Performance in Action is your companion guide to making websites faster. You'll learn techniques that speed the delivery of your site's assets to the user, increase rendering speed, decrease the overall footprint of your site, as well as how to build a workflow that automates common optimization techniques.

The full list of contents is available from Manning and WebPagetest users get 40% off with the discount code webpagetest40%.
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