Remember that translating your C# code into machine-executable code is a two-step process. The C# compiler generates IL that gets delivered in assemblies. The JIT compiler generates machine code for each method (or group of methods, when inlining is involved), as needed. Small functions make it much easier for the JIT compiler to amortize that cost. Small functions are also more likely to be candidates for inlining. It’s not just smallness: Simpler control flow matters just as much. Fewer control branches inside functions make it easier for the JIT compiler to enregister variables. It’s not just good practice to write clearer code; it’s how you create more efficient code at runtime.
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