Stoyan Stefanov (@stoyanstefanov) is known as one of the ‘sultans of speed’. In December 2009 he wrote a 24-day series on page speed which turned into a book offer.  He’s now writing that book in true open-sourced fashion.

Stoyan’s work-in-progress book is available to read at Book of Speed. If you have anything to add or even edits, you can fork the project on Github and submit a pull request with your changes.

Note: Take a look at the Github project just to see how it’s structured. Chapter text is in the /src folder with a build script to generate the TOC. This could be made into a very nice book starter project for anyone.