Explore strategies for delivering optimized images and videos to diverse devices in this 49-minute Devoxx conference talk. Learn how to enhance website performance by efficiently managing media content, which typically comprises 75% of page weight. Discover techniques for responsive images, progressive loading, and content optimization to ensure fast rendering across various screen resolutions and CPU capabilities. Gain insights into testing methods, implementing lazy loading, and leveraging new technologies like WebP and vector graphics. Dive into video optimization techniques, including preloading strategies, background video considerations, and adaptive streaming. Understand the impact of network conditions on media delivery and explore solutions such as the Save Data Header and Network Info API. Walk away with practical knowledge to significantly improve the speed and visual quality of your web content across all devices.