Ever since Google announced the webpage performance, as measured by Core Web Vitals (CWV) is a ranking factor starting May 2021, it has become the de-facto standard for measuring performance on the web. But while they seem straightforward, it turns out the CWV are anything but. In this talk we will dive into the technical details of CWV, and understand what they actually measure, and how they themselves are measured. What you learn in this talk will definitely surprise you! https://jsconfbp.com/speakers/dan-shappir About Dan Dan Shappir is the Performance Tech Lead at Next Insurance. Previously Dan was the Performance Tech Lead at Wix.com. Dan has over 25 years of software development experience, and has worked on systems ranging from multiuser games to missile trajectory simulations to designing and building large-scale Web applications used by hundreds of millions of users. He is a frequent speaker at technical conferences, a host and panelist on JavaScript Jabber podcast, and an Invited Expert on the W3C Web Performance Working Group. Dan holds an MSc in Computer Science.