using System;

using System.Diagnostics;

​

public interface IMyInterface

{

    void DoThing(); 

}

​

public class Implementation : IMyInterface

{

    private readonly Random _random = new Random();

    public int TotalValue { get; private set; }

​

    public void DoThing()

    {

        TotalValue += _random.Next(1, 11);

    }

}

public class Program

{

    private const int Iterations = 50000000;

    private static void DoThing(IMyInterface thing)

    {

        thing.DoThing();

    }

    private static void DoOtherThing<T>(T thing) where T : IMyInterface

    {

        thing.DoThing();

    }

    private static int Test(Action testAction)

    {

        var swatch = new Stopwatch();

        swatch.Start();

        for (var i = 0; i < Iterations; i++)

        {

            testAction.Invoke();

        }

        swatch.Stop();

        return (int)swatch.Elapsed.TotalMilliseconds;

    }

    public static void Main()

    {

        var thingOne = new Implementation();

        GC.Collect();

        var resultOne = Test(() => DoThing(thingOne));

        Console.WriteLine("Typed parameter test took: " + resultOne + "ms");

        var thingTwo = new Implementation();

        GC.Collect();

        var resultTwo = Test(() => DoOtherThing(thingTwo));

        Console.WriteLine("Generic parameter test took: " + resultTwo + "ms");

        var winner = resultOne > resultTwo ? "generic parameter" : "typed parameter";

        Console.WriteLine("The winner is " + winner);

    }

}