Performance of C# (.NET) Applications

The book «Performance of C# (.NET) Applications» is a practical guide for developers striving to create fast, responsive, and scalable applications on the .NET platform. In today's world, where every millisecond counts, knowledge of performance nuances becomes a mandatory skill for a senior developer.

What is this book about?

The author systematically covers the full cycle of performance work: from identifying bottlenecks to implementing effective solutions. You will learn:

• Profiling basics — how to use PerfView, dotTrace, BenchmarkDotNet, and built-in Visual Studio tools to find problems.
• Memory management — garbage collection, leaks, object pools, structs vs classes, Span and Memory.
• Asynchrony and parallelism — proper work with Task, ValueTask, Channel, Parallel.ForEach, and thread pools.
• Code optimization — avoiding allocations, working with LINQ, caching, aggressive inlining.
• Working with I/O and networking — asynchronous operations, buffering, latency reduction.
• High-performance patterns — Object Pool, Pipeline, Producer-Consumer, Lock-free structures.

Who is this book for?

The book is intended for C# developers with at least 1 year of experience who want to advance to a senior level. It will be useful for:

• Backend developers working with high-load services.
• Game developers using Unity (C#).
• .NET infrastructure and DevOps specialists.
• Anyone who wants to write code that operates at the platform's performance limits.

What will you learn?

After reading, you will be able to:

• Conduct profiling and benchmarking of any code.
• Eliminate memory leaks and reduce GC load.
• Optimize asynchronous operations and reduce response time.
• Apply modern .NET constructs (Span, Memory, IAsyncEnumerable).
• Design systems with predictable performance.

The book contains numerous code examples, real-world cases, and practical tips. All examples are relevant for .NET 6/7/8 and C# 10/11/12.

Dive into the world of high-performance .NET — start writing code that flies!