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Explore strategies for maintaining webpage performance while evolving site features and design in this 50-minute conference talk by Scott Jehl at performance.now() 2018. Learn how to address common conflicts between performance and elements like advertising, personalization, A/B testing, CMSs, and JavaScript frameworks. Discover practices that have helped major sites defend their speed without compromising functionality. Gain insights on topics such as the mobile web, first meaningful content, push vs. inline, preload, third-party scripts, and page weight. Access accompanying slides and learn more about the speaker and conference for a comprehensive understanding of balancing speed and functionality in web development.