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Day 5— .NET Performance Series
How Virtual, Sealed, and Static Methods Affect Performance in C#: A Developer’s Guide
Discover how virtual, sealed, and static methods in C# influence performance and JIT optimization. Learn best practices to enhance the speed and efficiency of your C# code.
4 min readApr 18, 2025
Access the complete performance series here
I saw a pull request with the title: “Convert static methods to virtual for testability.”
And just like that, my brain kicked back into gear.
The Real Cost of Abstraction
I’ve always been a fan of clean code — polished APIs, extensibility hooks, and testability patterns. But over time, I learned that these come at a cost. Not all costs are measured in lines of code or hours of debugging. Some are measured in CPU cycles, cache hits, and memory pressure. Especially when you’re deep in high-throughput services or…
