A comparison of performance between async/sync in C#

Async_Sync_Performance_comparison.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;

namespace AsyncPerf
{
    class Program
    {
        const int MAXRUNS = 10000000;
        const int BYTEARRAYSIZE = 1000;
        static MemoryStream ms = new MemoryStream();
        static byte[] bytes = new byte[BYTEARRAYSIZE];
        static void Main(string[] args)
        {
            var s = new Stopwatch();
            s.Start();
            for(var i = 0; i < MAXRUNS; i++)
            {
                Foo().Wait();
            }
            s.Stop();
            var asyncElapsed = s.Elapsed;

            s.Restart();
            for(var i = 0; i < MAXRUNS; i++)
            {
                Bar();
            }
            s.Stop();
            var syncElapsed = s.Elapsed;

            Console.WriteLine("Async: {0}", asyncElapsed);
            Console.WriteLine(" Sync: {0}", syncElapsed);
            Console.WriteLine(" Diff: {0}", asyncElapsed - syncElapsed);

            Console.ReadLine();
        }

        static async Task Foo()
        {
            ms.Seek(0, SeekOrigin.Begin);
            await ms.WriteAsync(bytes, 0, BYTEARRAYSIZE);
        }

        static void Bar()
        {
            ms.Seek(0, SeekOrigin.Begin);
            ms.Write(bytes, 0, BYTEARRAYSIZE);
        }
    }
}