Learn effective strategies for diagnosing and resolving performance issues in web applications through this informative conference talk. Discover how to identify bottlenecks, utilize browser developer tools, and implement simple yet powerful optimizations for both frontend and backend components. Explore techniques such as caching, CSS and JS optimization, dynamic imports, content placeholding, and optimistic updates to enhance perceived and actual speed. Gain insights into monitoring tools like JConsole for JVM applications and learn how to analyze REST endpoints and database performance. Walk away with a comprehensive plan to address client complaints about slow-loading web apps and improve overall user experience.