Span<T> Beats memcmp: Massive Performance Gains in .NET Byte Array Comparisons

This post benchmarks various byte array comparison methods in .NET, including `memcmp`, looping, `Enumerable.SequenceEqual`, and `Span.SequenceEqual`. Results show `Span.SequenceEqual` offers the best performance in .NET 8 and later, significantly outperforming `memcmp` and traditional looping, even on .NET Framework. For small arrays, looping is fastest, but `Span.SequenceEqual`'s advantage grows dramatically with array size. The author recommends using `IEnumerable.SequenceEqual` in .NET 8+ and `Span.SequenceEqual` in .NET Framework, avoiding `memcmp` and custom implementations.