Какой самый быстрый способ парсить?

using System;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.IO;
using System.IO.Compression;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Windows.Forms;
using System.Xml;

namespace CodeEvaler {
    public static class Program {
        public static void Main() {
            (new CodeEvaler()).Eval();
        }
    }

    public class CodeEvaler {
        public void Eval() {
            MakeRequests();
        }
//Calls request functions sequentially.
private void MakeRequests()
{
    HttpWebResponse response;
    string responseText;

    if (Request_wss_idex_market(out response))
    {
        //Success, possibly use response.
        responseText = ReadResponse(response);

        response.Close();
    }
    else
    {
        //Failure, cannot use response.
    }
}

//Returns the text contained in the response.  For example, the page HTML.  Only handles the most common HTTP encodings.
private static string ReadResponse(HttpWebResponse response)
{
    using (Stream responseStream = response.GetResponseStream())
    {
        Stream streamToRead = responseStream;
        if (response.ContentEncoding.ToLower().Contains("gzip"))
        {
            streamToRead = new GZipStream(streamToRead, CompressionMode.Decompress);
        }
        else if (response.ContentEncoding.ToLower().Contains("deflate"))
        {
            streamToRead = new DeflateStream(streamToRead, CompressionMode.Decompress);
        }

        using (StreamReader streamReader = new StreamReader(streamToRead, Encoding.UTF8))
        {
            return streamReader.ReadToEnd();
        }
    }
}

/// <summary>
/// Tries to request the URL: https://wss.idex.market/
/// </summary>
/// <param name="response">After the function has finished, will possibly contain the response to the request.</param>
/// <returns>True if the request was successful; false otherwise.</returns>
private bool Request_wss_idex_market(out HttpWebResponse response)
{
    response = null;

    try
    {
        //Create request to URL.
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://wss.idex.market/");

        //Set request headers.
        request.Headers.Set(HttpRequestHeader.Pragma, "no-cache");
        request.Headers.Set(HttpRequestHeader.CacheControl, "no-cache");
        request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36";
        request.Headers.Set(HttpRequestHeader.Upgrade, "websocket");
        request.Headers.Add("Origin", @"https://idex.market");
        request.Headers.Add("Sec-WebSocket-Version", @"13");
        request.Headers.Set(HttpRequestHeader.AcceptEncoding, "gzip, deflate, br");
        request.Headers.Set(HttpRequestHeader.AcceptLanguage, "en,ru;q=0.9");
        request.Headers.Set(HttpRequestHeader.Cookie, @"__cfduid=d88e16e134560b5565e4770398f9333521532634285");
        request.Headers.Add("Sec-WebSocket-Key", @"cj20R8IQfpldg9qv5JxoHw==");
        request.Headers.Add("Sec-WebSocket-Extensions", @"permessage-deflate; client_max_window_bits");

        //Get response to request.
        response = (HttpWebResponse)request.GetResponse();
    }
    catch (WebException e)
    {
        //ProtocolError indicates a valid HTTP response, but with a non-200 status code (e.g. 304 Not Modified, 404 Not Found)
        if (e.Status == WebExceptionStatus.ProtocolError) response = (HttpWebResponse)e.Response;
        else return false;
    }
    catch (Exception)
    {
        if(response != null) response.Close();
        return false;
    }

    return true;
}

    }
}

using WebSocketSharp;

using (var ws = new WebSocket("wss://ТВОЙПОТОК"))
{
ws.OnMessage += (sender, e) =>
project.SendInfoToLog(e.Data, true);
System.Threading.Thread.Sleep(2000);
ws.Connect();
System.Threading.Thread.Sleep(1000);
//у меня чтобы wss сервер начал отправлять данные, нужно было отправить ключевую фразу
ws.Send("сообщение которое нужно отправить");
//паузу и выход по действию прикрутиш уже сам,
System.Threading.Thread.Sleep(5000);
}

using (var ws = new WebSocket("wss://ТВОЙПОТОК"))
{
ws.OnMessage += (sender, e) =>
project.SendInfoToLog(e.Data, true);
ws.Connect();
//паузу и выход по действию прикрутиш уже сам,
System.Threading.Thread.Sleep(5000);
}