Low Performance when useing Handler.ashx to show Photo.

<%@ WebHandler Language="C#" Class="Handler" %>

using System;
using System.Web;
using System.Data.SqlClient;
public class Handler : IHttpHandler {

    SqlConnection myConnection;
    SqlCommand cmd;
    
    public Handler()
    {
        myConnection = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["myDB"].ConnectionString);
        cmd = new SqlCommand("", myConnection);
        myConnection.Open();
    }
    public void ProcessRequest (HttpContext context) {
        try
        {
            string sql = "Select TPImage,id,Image_Type from TProduct where Id=@Id";
            cmd.CommandText = sql;
            cmd.Parameters.Add("@Id", System.Data.SqlDbType.Int).Value =    context.Request.QueryString["Id"];
            cmd.Prepare();
            SqlDataReader dr = cmd.ExecuteReader();
            dr.Read();
            context.Response.ContentType = dr["Image_Type"].ToString();
            
            context.Response.BinaryWrite((byte[])dr["TPImage"]);
            //باید برای عکس یکی از این فایل ساخته شود تا که بتونی هر عکس رو جدا لود کرد.
            dr.Close();
            myConnection.Close();
        }
        catch (Exception ex)
        {
            //System.Windows.Forms.MessageBox.Show(ex.Message);
        }
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

}