Learn how to optimize Content Delivery Network (CDN) caching systems through modular simulation techniques in this 29-minute conference talk from Regional SDC Austin 2024. Explore methods for evaluating various CDN configurations by breaking down complex systems into modular components that can be quickly tested and analyzed. Discover approaches for incorporating real-world CDN traces to create realistic testing scenarios, visualizing performance metrics, and comparing different system variations. Gain insights into accelerating the development cycle by using simulations that can be built in weeks rather than spending months or years on live system testing. Presented by Andy Banta from Magnition IO, this talk builds upon previous work on optimizing hierarchical memory systems and demonstrates practical techniques for improving CDN performance through simulation-based optimization.