If you want your site to succeed, you need to deliver a consistently fast user experience. But how do you quantify "fast"? And how do you track speed across millions and billions of user visits?
When we think about measuring web performance, it’s easy to fall into an abyss of metrics. TCP connection, TTFB, start render, PageSpeed and YSlow scores. Which ones should we care about? In this talk, I share my 10-year quest in search of a unicorn metric for measuring user engagement and web performance.