experience some delay in updatepanel with internet explorer?

i have tree menu and updatepanel. the selectednotechange in the tree menu triggers asyn-postback in updatepanel. I'm experiencing some delay when using with internet exploere. but works fine with firefox and opera. around 2 seconds delay when using with IE but quick with firefox and opera.

is anyone experiencing similar problem? i think was fine in ajax beta version but experienceing ajax RC version

i can see major performace issue between internet explorer and other browser. Although it is just 1 or 2 sec delay per click in internet explorer it is STILL performace issue.

IS ANY ONE EXPERIENCING PERFORMACE ISSSUE WITH INTERNET EXPLORER??

i have noticed similar performance difference between IE 7 and Firefox. Below is the code i use. IE takes around 2-3 secs for every OnSelectedNodeChanged but firefox displays the result within 1 sec. What could be the problems ?? Gridview at maximum will have 20-30 rows and 6 columns, and is all text. I belive it was working efficiently in ajax beta versions, but surely seem to have problem with IE.

Shouldn't IE be the primary and supported browser for all microsoft products?????

<asp:TreeView ID="TreeView1" runat="server" Font-Size="Small" Font-Names="Arial" OnSelectedNodeChanged="TreeView1_SelectedNodeChanged"/>

<asp:UpdatePanel ID="up1" RenderMode="Inline" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<asp:GridView ID="GridView1" runat="server" />

</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="TreeView1" EventName="SelectedNodeChanged" />
</Triggers>
</asp:UpdatePanel>

need help or other options ?

I have seen similar things when my UpdatePanel is very large, or a GridView without paging has a lot of rows and columns. To fix it, I used multiple updatepanels, and enabled paging on my gridview. IE still is a little slower than Firefox but not too bad.