Webpage performance is a high priority for any site of scale today, but it can be easier to build a fast site than it is to maintain one. As a site's features and design evolves, its performance is often threatened for a number of reasons, making it hard to ensure fast, broad access to services. In this session, Scott will consider common conflicts between performance and features such as advertising, personalization, A/B testing, CMSs, and JavaScript frameworks, and share some practices that have helped major sites defend their speed without compromises. Slides: https://drive.google.com/file/d/19jLMyN7b2giFVnaqOgWxx9Nnqcgd4vlX/view About Scott: https://scottjehl.com More about performance.now(); https://perfnow.nl or https://twitter.com/perfnowconf Receive conference announcements in your inbox: https://perfnow.nl/subscribe