Discover the critical steps to enhance web performance in this conference talk from AmsterdamJS 2017. Explore the importance of defining and measuring performance, utilizing tools like Chrome Dev Tools, Page Speed Insights, and Lighthouse. Learn optimization techniques for deferring non-critical assets, optimizing JavaScript and CSS, and improving media handling. Delve into network optimization strategies, including HTTP/2, preloading, and offline capabilities with Service Workers. Gain insights on creating consistent experiences across various devices and network conditions, ensuring optimal performance for users worldwide.