Ускорение загрузки файлов

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Я создаю загрузчик файлов в ASP.NET используя C#, но когда я загружаю большой файл, он занимает много времени для загрузки

Как мне его ускорить?

Что я уже пробовал:

protected void Button1_Click(object sender, EventArgs e)
   {
       if (FileUpload1.HasFiles)
       {
           foreach (HttpPostedFile postedfile in FileUpload1.PostedFiles)
           {
               byte[] img = new byte[postedfile.ContentLength];
               postedfile.InputStream.Read(img, 0, postedfile.ContentLength);

               string file_ext = postedfile.FileName;
               string ext = Path.GetExtension(file_ext);

               // ftp
               if ((ext.ToLower() == ".jpg") || (ext.ToLower() == ".jpeg") || (ext.ToLower() == ".gif") || (ext.ToLower() == ".png"))
               {
                   Random rnd = new Random();
                   int card = rnd.Next();
                   string location_filename = "/Album/" + Album_Id + "/" + card + "_" + file_ext;
                   System.Windows.Forms.MessageBox.Show(location_filename);

                   MemoryStream stream = new MemoryStream(img);
                   System.Drawing.Image image = System.Drawing.Image.FromStream(stream);
                   if ((image.Width > 250 && image.Width < 3650) && (image.Height > 250) && image.Height < 4450)
                   {
                       ftp_class.UploadFileToFTP(img, location_filename);
                   }
                   else
                   {
                       // Label1.Text = "Image is To Large";

                   }
                   //    File.WriteAllBytes(Server.MapPath("~/Property/") + Property_ID + "/" + card + file_ext, img);
               }
           }
       }

public class ftp_class
   {
       static String ftpusername = "Ftp_ExampleCodeExample"; // e.g. username
       static String ftppassword = "Example@123"; // e.g. password


       public static void CreateDirectoryToFTP(string directory)
       {
           try
           {
              // Directory.CreateDirectory(System.Web.Hosting.HostingEnvironment.ApplicationPhysicalPath + "/" + directory);



               FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create("ftp://example.com/" + directory);
               ftp.Credentials = new NetworkCredential(ftpusername, ftppassword);
               ftp.KeepAlive = true;
               ftp.UseBinary = true;
               ftp.Method = WebRequestMethods.Ftp.MakeDirectory;
               FtpWebResponse responseFileDelete = (FtpWebResponse)ftp.GetResponse();

           }
           catch (Exception ex)
           {
               //  alert_message.alert_message_show("ftp:" + ex);
           }
       }
       public static void UploadFileToFTP(byte[] img, string location_filename)
       {
           try
           {
             //  File.WriteAllBytes(System.Web.Hosting.HostingEnvironment.ApplicationPhysicalPath + "/" + location_filename, img);


               FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create("ftp://example.com/" + location_filename);
               ftp.Credentials = new NetworkCredential(ftpusername, ftppassword);
               ftp.KeepAlive = true;
               ftp.UseBinary = true;
               ftp.Method = WebRequestMethods.Ftp.UploadFile;
               Stream ftpstream = ftp.GetRequestStream();
               ftpstream.Write(img, 0, img.Length);
               ftpstream.Close();

           }
           catch (Exception ex)
           {
               //extra.alter_box("" + ex);
               //   alert_message.alert_message_show("ftp:" + ex);
           }
       }

   }

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