Discover how to leverage WebPageTest's new features to automate performance improvements through experiments in this informative video. Learn about the inner workings of WebPageTest, interpret metrics for decision-making, and address first input delay issues. Explore techniques for testing code changes without altering the codebase, and gain insights into recent WebPageTest innovations. Delve into practical examples, including viewing CSS inline and analyzing poorly performing web pages. Master the create experiments tool and find out where to access additional WebPageTest resources. This comprehensive tutorial, featuring guest expert Scott Jehl, provides valuable knowledge for optimizing Core Web Vitals and enhancing overall website performance.