Properties vs Fields – speed comparison

class X

    {

private int _p1;

private int _p2;

public int P1

        {

set => _p1 = value;

get => _p1;

        }

public int P2

        {

set => _p2 = value;

get => _p2;

        }

public int A1 { set; get; }

public int A2 { set; get; }

public int F1;

public int F2;

    }

class Program

    {

static void Main(string[] args)

        {

int N = 100_000_000;

            X x = new X();

            Stopwatch sw = new Stopwatch();

            Console.ReadLine();

            sw.Start();

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

            {

                x.P1++;

                x.P2 = x.P1;

            }

            sw.Stop();

            Console.WriteLine(x.P2 + "   " + sw.Elapsed);

//output: 99999999   00:00:01.4351390

            sw.Reset();

            sw.Start();

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

            {

                x.A1++;

                x.A2 = x.A1;

            }

            sw.Stop();

            Console.WriteLine(x.A2 + "   " + sw.Elapsed);

//output: 99999999   00:00:01.4296915

            sw.Reset();

            sw.Start();

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

            {

                x.F1++;

                x.F2 = x.F1;

            }

            sw.Stop();

            Console.WriteLine(x.F2 + "   " + sw.Elapsed);

//output: 99999999   00:00:00.2331003

            Console.ReadLine();

        }

    }