The web is more complex now than ever before. Web pages today contain hundreds of objects — images, stylesheets, and JavaScript; not to mention a lot of slow-loading third-party scripts — that all need to load before users can fully enjoy their web browsing experience. However, the more objects we add to a page, the slower the page gets, leading to user frustration and, even worse, page abandonment. \r\n I am proud to say that our community is extremely motivated to improve web performance and provide browsing experiences that users enjoy. To do this, we need to rethink how we measure our performance goals to satisfy the growing speed expectations of our (impatient) users. We need to measure what matters the most for our users, i.e., those elements that directly influence their experiences. \r\n For so long, we have relied on the onLoad event triggered by web browsers to measure how fast websites load and translate that into users’ experiences with the web.…