Telerik RadGrid Add/Edit Row Performance Issue - asp.net

Question

In a Telerik RadGrid, the user has the ability to add a row and edit an existing one. It appears that the grids actually force a postback to occur before the UI controls are rendered on the screen. I'm noticing a second to two seconds delay from the time the button is clicked to the time the controls appear. This seems about a second to two seconds too long. Here is my code, I'm not exactly sure what the bug is.
I apologize in advance for the "whatz wrongz with me codez post", but this seems like the easiest way to go about this one. Again, I have a performance issue and would like to figure out how to solve it in terms of what code needs to be tweaked.....
<asp:UpdatePanel ID="upPhone" runat="server">
<contenttemplate>
<telerik:RadGrid runat="server" ID="gridPhone" DataSourceID="dsPhone" AutoGenerateColumns="False"
Width="100%" AllowAutomaticDeletes="True" AllowAutomaticInserts="True"
GridLines="None" Skin="Vista" AllowAutomaticUpdates="True"
ondatabound="gridPhone_DataBound" onitemdeleted="gridPhone_ItemDeleted"
oniteminserted="gridPhone_ItemInserted"
onitemupdated="gridPhone_ItemUpdated"
onneeddatasource="gridPhone_NeedDataSource">
<MasterTableView DataKeyNames="phone_id" CommandItemDisplay="Top"
EditMode="InPlace" AllowFilteringByColumn="False">
<Columns>
<telerik:GridEditCommandColumn ButtonType="ImageButton" UniqueName="EditCommandColumn">
<ItemStyle CssClass="MyImageButton" />
</telerik:GridEditCommandColumn>
<telerik:GridBoundColumn DataField="phone_id" ReadOnly="true" UniqueName="phone_id"
Visible="false">
</telerik:GridBoundColumn>
<telerik:GridDropDownColumn DataField="d_phone_type_id" DataSourceID="dsPhoneType"
UniqueName="d_phone_type_id" DataType="System.Int32" ListValueField="d_phone_type_id"
ListTextField="name" HeaderText="Type">
</telerik:GridDropDownColumn>
<telerik:GridTemplateColumn HeaderText="Number" SortExpression="number" UniqueName="number">
<ItemTemplate>
<asp:Label runat="server" ID="lblPhoneNumber" Text='<%# Eval("number", "{0:(###) ###-####}") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtNumber" MaxLength="10" runat="server" Text='<%# Bind("number") %>'></asp:TextBox>
</EditItemTemplate>
</telerik:GridTemplateColumn>
<telerik:GridBoundColumn DataField="description" UniqueName="description" HeaderText="Description">
</telerik:GridBoundColumn>
<telerik:GridCheckBoxColumn DataField="isprimary" UniqueName="isprimary" HeaderText="Primary"
DataType="System.Int16">
</telerik:GridCheckBoxColumn>
<telerik:GridButtonColumn ConfirmText="Delete this number?" ConfirmDialogType="RadWindow"
ConfirmTitle="Delete" ButtonType="ImageButton" CommandName="Delete" Text="Delete"
UniqueName="DeleteColumn">
<ItemStyle HorizontalAlign="Center" CssClass="MyImageButton" />
</telerik:GridButtonColumn>
</Columns>
<EditFormSettings>
<EditColumn UniqueName="EditCommandColumn1">
</EditColumn>
</EditFormSettings>
</MasterTableView>
<ClientSettings>
<Selecting AllowRowSelect="True" />
</ClientSettings>
</telerik:RadGrid>
<asp:ObjectDataSource ID="dsPhoneType" runat="server"
OldValuesParameterFormatString="original_{0}" SelectMethod="GetPhoneTypes"
TypeName="DataAccess"></asp:ObjectDataSource>
<asp:SqlDataSource ID="dsPhone" runat="server" ConnectionString="<%$ ConnectionStrings:TBD %>"
DeleteCommand="DELETE FROM [phone] WHERE [phone_id] = #phone_id" InsertCommand="INSERT INTO [phone] ([person_id],[d_phone_type_id], [number], [description], [isprimary]) VALUES (#person_id,#d_phone_type_id, #number, #description, #isprimary)"
SelectCommand="get_PhoneById" UpdateCommand="UPDATE [phone] SET [d_phone_type_id] = #d_phone_type_id, [number] = #number, [description] = #description, [isprimary] = #isprimary WHERE [phone_id] = #phone_id"
SelectCommandType="StoredProcedure">
<SelectParameters>
<asp:ControlParameter ControlID="lblID" Name="person_id" PropertyName="Text" Type="Int32" />
</SelectParameters>
<DeleteParameters>
<asp:Parameter Name="phone_id" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp:Parameter Name="d_phone_type_id" Type="Int32" />
<asp:Parameter Name="number" Type="Int64" />
<asp:Parameter Name="description" Type="String" />
<asp:Parameter Name="isprimary" Type="Boolean" />
<asp:Parameter Name="phone_id" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asp:ControlParameter ControlID="lblID" Name="person_id" PropertyName="Text" />
<asp:Parameter Name="d_phone_type_id" Type="Int32" />
<asp:Parameter Name="number" Type="Int64" />
<asp:Parameter Name="description" Type="String" />
<asp:Parameter Name="isprimary" Type="Boolean" />
</InsertParameters>
</asp:SqlDataSource>
</contenttemplate>
</asp:UpdatePanel>

Answer 1

Just a couple of things to check:
Are you duplicating the bind behaviour in the gridPhone_NeedDataSource event, your ItemUpdated, Deleted and Inserted events, and the native Rad Grid binding behviour (by using a asp:SqlDataSource control)? It would be useful to see your code-behind to see if you are or not.
How many records do you have in the grid? I find if I have a large number of items in the Grid and have some of the advanced features turned on (I've noticed you've got row selecting enabled) the grid grinds to a halt.
If none of these work/apply to your situation then it maybe worth checking the performance section of their site.

Answer 2

I am seeing that you are using DataSourceID="dsPhone" and onneeddatasource="gridPhone_NeedDataSource"
not sure if you need both. Also make sure you dont do a DataBind() else where in your code (page_Load or any other place) since you already have OnNeedDataSource event attached to the grid