Andrew Lock • 4/21/2026

Removing byte[] allocations in .NET Framework using ReadOnlySpan<T>

This article explains how to remove unnecessary byte[] allocations in .NET applications, including older runtimes like .NET Framework, by leveraging ReadOnlySpan<T> and Span<T>. It covers the basics of Span<T> for creating views over memory without copying, using stackalloc for small buffers to reduce garbage collection pressure, and compiler optimizations. The post also discusses caveats, such as limited performance benefits on .NET Framework compared to .NET Core, and provides practical examples for performance-sensitive C# code.

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#performance #c #Span