Bits of .NET

Allocating large arrays repeatedly kills performance.

var pool = ArrayPool<byte>.Shared;
var buffer = pool.Rent(4096);

// use buffer

pool.Return(buffer);

Why this matters

• Reduces GC pressure dramatically

• Ideal for serializers, streams, IO-heavy code

• Used internally by ASP.NET Core

⚠ Always return the array — leaks are silent.