C generic speed

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MyGeneric
{
    
    public class Monitor
    {
    
        static void Main(string[] args)
        {
    
            Show();
            Console.ReadKey();
        }
        public static void Show()
        {
    
            Console.WriteLine("****************Monitor******************");
            {
    
                int iValue = 12345;
                long commonSecond = 0;
                long objectSecond = 0;
                long genericSecond = 0;
                const Int64 cycle = 1000000000;

                {
    
                    Stopwatch watch = new Stopwatch();
                    watch.Start();
                    for (int i = 0; i < cycle; i++)
                    {
    
                        ShowInt(iValue);
                    }
                    watch.Stop();
                    commonSecond = watch.ElapsedMilliseconds;
                }
                {
    
                    Stopwatch watch = new Stopwatch();
                    watch.Start();
                    for (int i = 0; i < cycle; i++)
                    {
    
                        ShowObject(iValue);
                    }
                    watch.Stop();
                    objectSecond = watch.ElapsedMilliseconds;
                }
                {
    
                    Stopwatch watch = new Stopwatch();
                    watch.Start();
                    for (int i = 0; i < cycle; i++)
                    {
    
                        Show<int>(iValue);
                    }
                    watch.Stop();
                    genericSecond = watch.ElapsedMilliseconds;
                }
                Console.WriteLine("commonSecond={0}\r\n objectSecond={1}\r\n genericSecond={2}\r\n"
                    , commonSecond, objectSecond, genericSecond);
            }
        }

        #region PrivateMethod
        private static void ShowInt(int iParameter)
        {
    
            //do nothing
        }
        private static void ShowObject(object oParameter)
        {
    
            //do nothing
        }
        private static void Show<T>(T tParameter)
        {
    
            //do nothing
        }
        #endregion

    }
}

As can be seen from the results ： Generic methods have the highest performance , Next is the common method ,object The method has the lowest performance .