I use Ajax But too slow

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ASP.NET

i Use ajax to Call Codebehind Method Witch select Data From sql server DataBase But the response is too slow
Code :
C# :

 [WebMethod]
public static string GetData(int ID)
{
 cmd.CommandText = "Select Name From table1 Where ID =" + ID;
    return   cmd.ExecuteScalar().ToString();
}

ajax :

<script type="text/javascript" language="javascript">
      
       function  GetDatainajax(node)
       {
         PageMethods.GetData(1,showdata);
       
       }
       function showdata(res)
       {       
           var elem = document.getElementById("text");
          
           elem.innerText = res;
       }
  <script>

i Need Help to get response more Fast