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This book teaches experienced .NET developers how to understand, measure, diagnose, and systematically improve the performance of modern .NET applications from source code down to the CPU and operating system. You will learn how the .NET runtime executes your code, how the JIT compiler translates C# into machine instructions, how the garbage collector manages memory, how modern CPUs execute those instructions, and how to use professional tooling to find and fix real bottlenecks. The book is built around .NET 8 LTS and C# 12, with version-specific behavior clearly identified where it matters.

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Kick off your book project, get started with GhostAI, get better at marketing, or spend the day doing all three! Free live workshops on Zoom. Saturday, June 27, 2026.

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