In this session I will show you real-world examples of code and techniques used to improve the performance of the RabbitMQ .NET Client, a .NuGet package with over forty-nine million downloads on NuGet. You will learn about memory allocations and their impact on the garbage collector and performance optimization techniques. You will get to know .NET language features like ref structs and ref parameters, code inlining, .NET constructs like Span< T >, Memory< T >, ArrayPool and even some unsafe code. There will be benchmarks and real code that you can apply to your own solutions and, who knows, you might even catch the occasional glimpse of some assembly code!