Performance cannot be bolted onto an application after deployment—it must be designed in from day one. In this session, we explore the architectural decisions, patterns, and practices that drive high-performance ASP.NET Core systems in real-world enterprise environments. Learn how hosting models, middleware pipelines, caching strategies, dependency lifetimes, async usage, and serialization choices impact throughput and latency. We’ll examine common bottlenecks seen in production systems, demonstrate profiling with Visual Studio and runtime diagnostics, and discuss how to scale effectively in cloud environments. Attendees leave with a practical framework for building resilient, fast web applications before problems reach production.