AwaitVSPassThrough

namespace ConsoleApplication1
{
    using System;
    using System.Diagnostics;
    using System.Threading.Tasks;

    internal sealed class Program
    {
        private static readonly Task CachedTask = Task.FromResult(false);

        private static void Main(string[] args)
        {
            Bench(100000000);
        }

        private static void Bench(int iterations)
        {
            Stopwatch stopwatch = new Stopwatch();

            stopwatch.Start();
            for (int i = 0; i < iterations; i++)
            {
                PassThroughAsync().Wait();
            }

            double passThroughTime = stopwatch.Elapsed.TotalMilliseconds;
            Console.WriteLine(passThroughTime);

            stopwatch.Restart();

            for (int i = 0; i < iterations; i++)
            {
                AwaitAsync().Wait();
            }

            double awaitTime = stopwatch.Elapsed.TotalMilliseconds;
            Console.WriteLine(awaitTime);

            Console.WriteLine("Pass through is {0:0.0} times faster than await.", awaitTime / passThroughTime);
        }

        private static Task PassThroughAsync()
        {
            return CachedTask;
        }

        private static async Task AwaitAsync()
        {
            await CachedTask;
        }
    }
}