Скорость парсинга - от чего зависит? - C#

using System;
using System.IO;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
 
namespace Ret
{
    class Program
    {
        static void Main(string[] args)
        {

                        var dt = DateTime.Now;
                        string input = "http://www.giport.ru/";
                        string html = string.Empty;
                        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(input);
                        request.AllowAutoRedirect = false;
                        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                        string pattern = @"<span >([+]?[0-9][0-9])";
                        StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(1251));
                        html = sr.ReadToEnd();
                        MatchCollection mc = Regex.Matches(html, pattern);
                        foreach (Match m in mc)
                        {
                            
                            var diff = DateTime.Now - dt;
                            Console.WriteLine(m.Groups[1].Value);
                            Console.WriteLine(diff);                          
                            Console.ReadKey();
                        }

        }
 
    }
 
}