Have fun :) https://speakerdeck.com/dzuelke/the-twelve-factor-app-and-php-on-heroku https://speakerdeck.com/jaytaph/the-first-few-milliseconds-of-https-loadays http://ilia.ws/files/ipc2014\_bottlenecks.pdf The talk Code Coverage: Covered in Depth by Sebastian Bergmann can be found directly on the thePHP.cc website.