using System;

using System.Linq;

using System.Diagnostics;

using System.Threading.Tasks;

using System.Collections.Generic;

public class Program

{

    public class A

    {

        public async Task<bool> process1()

        {

            var a ="";

            for(int i= 0; i < 1000; i++)

                a += "a";

            return true;

        }

    }

    public async static Task Main()

    {

        var ins = new A();

        Stopwatch sw = new Stopwatch();

        sw.Start();

        var a = ins.process1();

        var b = ins.process1();

        var taskList = new List<Task>{ a, b};

        await Task.WhenAll(taskList);

        sw.Stop();

        var cont1 = sw.ElapsedTicks;

        sw.Reset();

        sw.Start();

        var c = ins.process1();

        var d = ins.process1();

        var taskList2 = new List<Task>{Task.Run(async ()=> { await c;}), Task.Run(async () => {await d;})};

        await Task.WhenAll(taskList2);

        sw.Stop();

        var cont2 = sw.ElapsedTicks;

        Console.WriteLine("C1: "+ cont1);

        Console.WriteLine("C2: "+ cont2);

    }

}