Update panel taking long time to respond

<div style="display: none;"><div id="001" style="width:400px;height:275px; overflow:hidden; background-image:removed(image/bg.jpg.pagespeed.ce.hBQipZqWVe.jpg);">
   <asp:ScriptManager ID="ScriptManager1" runat="server">
      </asp:ScriptManager>
      
  <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
  <ContentTemplate>
  <table width="400px" height="110px" class="align" style="font-family: Arial, Helvetica, sans-serif; color: #000000; font-size: medium">
  <br />
   <center>
       
        <font color="Green">   <h1>
               Log in</font></h1></center>
   
    
<font style="font-family: Arial, Helvetica, sans-serif; font-size:15px; color:black;"> Email:</font> <fieldset>   <asp:TextBox ID="TextBox1" runat="server"  Width="200px" Height="30px"></asp:TextBox></fieldset>  
<font style="font-family: Arial, Helvetica, sans-serif; font-size:15px; color:black;"> Password: </font>  <fieldset><asp:TextBox ID="TextBox2" runat="server"  TextMode="Password"  Width="200px" Height="30px" ></asp:TextBox></fieldset>
      <asp:Button ID="Button2" runat="server"  Text="Login" onclick="Button2_Click" CssClass="sub5"/>  
    <br />
    <br />
    <asp:Label ID="Label1" runat="server"></asp:Label>
    
   
   </table>
   </ContentTemplate>
<Triggers>
 <asp:AsyncPostBackTrigger ControlID="Button2"
 EventName="Click" />
</Triggers>
   </asp:UpdatePanel>
    
   
  
   
   </div></div>