Ajax update panel too slow in Asp.net. How to resolve? - asp.net

Question

I just update the ID passed in NavigateURL of Hyperlink during the selectedindexchanged in my RadioButtonList.
In Mozilla it takes 3.26 seconds for the ID to get updated in Hyperlink
The other browsers also takes too long.
How can i resolve this ?
I read a lot of articles and took the following measures :
Set Debug to false in web.config
Use conditional in Update mode
Only use the controls that has to be updated in the Update panel.
But still, it takes 3.26 seconds...
Protected Sub chlTypes_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles chlTypes.SelectedIndexChanged
If (chlTypes.SelectedItem.Value.ToString() <> "") And (chlTypes.SelectedItem.Value.ToString() <> "0") Then
HypView.NavigateUrl = "~/Content.aspx?ID=" + chlTypes.SelectedItem.Value.ToString()
End If
End Sub
<table id="tbl1">
<tr>
<td>
<asp:UpdatePanel ID="UP1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:RadioButtonList ID="chlTypes" runat="server" AutoPostBack="true">
</asp:RadioButtonList>
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
<tr>
<td align="right">
<asp:UpdatePanel ID="UP2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div class="caregiver_view_button">
<asp:HyperLink ID="HypView" class="caregiver_view_button"
runat="server"><img src="/view_button.png" /></asp:HyperLink>
</div>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="chlTypes" />
</Triggers>
</asp:UpdatePanel>
</td>
</tr>
</table>