using System;
using System.Diagnostics;
using System.Linq;

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();

            for (int i = 0; i < 100; i++)
            {
                var files = System.IO.Directory.GetFiles(@"F:\pictures", "A14881*.jpg", System.IO.SearchOption.TopDirectoryOnly);
            }

            sw.Stop();

            Console.WriteLine(sw.Elapsed.ToString());
            // Folder size: 140.000 files -- 4 files matching searchFilter
            // net5.0: 3.3 seconds
            // net471: 0.0033 seconds (1000 times faster)

            Console.ReadLine();
        }
    }
}