【C# .NET10 Preview5】ローカルのデリゲートをスタックに置く最適化 #C# – Qiita

using System.Runtime.CompilerServices;

public class __EscapeAnalysisForDelegatesTest
{
    static void Performance(Performance p)
    {
        p.AddTest("Delegate", () =>
        {
            int sum = 0;
            for (int i = 0; i  100000; i++)
            {
                int local = i;
                var func = (int x) => x + local;
                sum += func(i);
            }
        });

        p.AddTest("LocalMethod", () =>
        {
            int sum = 0;
            for (int i = 0; i  100000; i++)
            {
                int local = i;
                [MethodImpl(MethodImplOptions.NoInlining)]
                int Func(int x) => x + local;
                sum += Func(i);
            }
        });

        p.AddTest("Inlining", () =>
        {
            int sum = 0;
            for (int i = 0; i  100000; i++)
            {
                int local = i;
                [MethodImpl(MethodImplOptions.AggressiveInlining)]
                int Func(int x) => x + local;
                sum += Func(i);
            }
        });
    }
}