public class NewBehaviourScript : MonoBehaviour {

    // Use this for initialization

    void Start () {

    }

    static void TestXmlLoad(string xml)

    {

        SecurityParser parser = new SecurityParser();

        parser.LoadXml(xml);

    }

    static void TestSystemXMLLoad(string xml)

    {

        XmlDocument doc = new XmlDocument();

        doc.LoadXml(xml);

    }

    int count = ;

    // Update is called once per frame

    void Update () {

        if(++count == )

        {

            string xmlText = File.ReadAllText(@"F:\Projects\TestPXML\TestPXML\test.xml");

            int LoadCount = ;

            Stopwatch stopwatch = new Stopwatch();

            {

                stopwatch.Start();

                for (int i = ; i < LoadCount; ++i)

                {

                    TestXmlLoad(xmlText);

                }

                UnityEngine.Debug.Log(string.Format("MonoXml Load:{0}", stopwatch.Elapsed));

            }

            {

                stopwatch.Stop();

                stopwatch.Start();

                for (int i = ; i < LoadCount; ++i)

                {

                    TestSystemXMLLoad(xmlText);

                }

                UnityEngine.Debug.Log(string.Format("SystemXml Load:{0}", stopwatch.Elapsed));

            }

        }

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Xml;

using Mono.Xml;

using System.Diagnostics;

namespace TestPXML

{

    class Program

    {

        private static List<object> Caches = new List<object>();

        static void Main(string[] args)

        {

      //      Console.WriteLine("prepare load from monoxml");

       //     Console.ReadKey();

            string xmlText = Encoding.UTF8.GetString(Properties.Resources.SettlementForm);

            int LoadCount = ;

            GC.Collect();

            GC.Collect();

            Stopwatch stopwatch = new Stopwatch();

//             {

//                 stopwatch.Start();

//

//                 for(int i=0; i<LoadCount; ++i)

//                 {

//                     TestXmlLoad(xmlText);

//                 }

//

//                 Console.WriteLine($"MonoXml Load:{stopwatch.Elapsed}");

//             }

            Console.WriteLine("prepare load from system.xml");

            Console.ReadKey();

            {

                stopwatch.Stop();

                stopwatch.Start();

                for (int i = ; i < LoadCount; ++i)

                {

                    TestSystemXMLLoad(xmlText);

                }

                Console.WriteLine($"SystemXML Load:{stopwatch.Elapsed}");

            }

            GC.Collect();

            GC.Collect();

            Console.WriteLine("all done, press any key.");

            Console.ReadKey();

        }

        static void TestXmlLoad(string xml)

        {

            SecurityParser parser = new SecurityParser();

            parser.LoadXml(xml);

            Caches.Add(parser);

        }

        static void TestSystemXMLLoad(string xml)

        {

            XmlDocument doc = new XmlDocument();

            doc.LoadXml(xml);

            Caches.Add(doc);

        }

    }

}