dotnet-performance-patterns

Performance-oriented architecture patterns for .NET applications. Covers zero-allocation coding with Span<T> and Memory<T>, buffer pooling with ArrayPool<T>, struct design for performance (readonly struct, ref struct, in parameters), sealed class devirtualization by the JIT, stack-based allocation with stackalloc, and string handling performance. Focuses on the why (performance rationale and measurement) rather than the how (language syntax).

Version assumptions: .NET 8.0+ baseline. Span<T> and Memory<T> are available from .NET Core 2.1+ but this skill targets modern usage patterns on .NET 8+.

Scope

• Zero-allocation coding with Span and Memory
• Buffer pooling with ArrayPool
• Struct design for performance (readonly struct, ref struct, in parameters)
• Sealed class devirtualization by the JIT
• Stack-based allocation with stackalloc
• String handling performance patterns

Out of scope

• C# language syntax for Span, records, pattern matching -- see [skill:dotnet-csharp-modern-patterns]
• Coding standards and naming conventions -- see [skill:dotnet-csharp-coding-standards]