Explore web performance optimization techniques in this conference talk from NDC London 2022. Learn why fast websites are crucial for business success and search engine rankings. Discover best practices and clever optimizations used by high-performing sites to outpace competitors. Dive into topics such as Core Web Vitals, Largest Contentful Paint (LCP), measuring performance with CRUX and Real User Metrics, caching strategies, compression techniques, and image optimization. Examine advanced concepts like Anycast, Head of Line Blocking, HTTP/2 Multiplexing, and TLS 1.3. Gain insights on parallel requests, using the async attribute, and implementing lazy loading for images to enhance website speed and user experience.