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Day 3 — .NET Performance Series
ref struct vs. readonly struct vs. record struct: Which Performs Best in High-Performance C# Scenarios?
ref struct vs readonly struct vs record struct — Which is best for high-performance C# applications? Get performance insights and expert tips.
4 min readApr 16, 2025
Access the complete performance series here
It started with a profiling session.
I was knee-deep in optimizing a backend engine for a real-time telemetry ingestion system — a pipeline crunching millions of datapoints per minute. The CPU was spiking. GC pressure was intense. And I had a hunch: structs. More precisely, how I was using them.
In C#, structs can be slippery. Powerful, yes, but a double-edged sword. I had used them generously across the hot path of our ingestion loop.
