Group Auto Expand scrolling

[Voss Grose]

I've seen a few other posts about this, but I'm getting really bad performance on vertical scrolling when AutoExpandGroups="True".

I only have about 200 rows.

EnableRowVirtualization="True"

The Grid does have a vertical scroll bar visible at all times.

If I remove the Group there is no performance issue at all.

I'm using Q4 2010 release.

Has anything changed to improve this in Q1 2011?

thanks,
voss.

Follow up: Part 2:

If I remove the Grouping and add the following code it degrades performance by about 50% even without the grouping.
<telerik:GridViewDataColumn Header="" UniqueName="Id" DataMemberBinding="{Binding Id}" Width="22" TextAlignment="Left" HeaderTextAlignment="Center">
                        <telerik:GridViewDataColumn.CellTemplate>
                            <DataTemplate>
                                <Button x:Name="btnActions" Height="25" Width="23" BorderThickness="0">
                                    <telerik:RadContextMenu.ContextMenu>
                                        <telerik:RadContextMenu x:Name="cmActions" Width="160" Height="Auto">
                                            <telerik:RadMenuItem Header="Edit Reservation"  Tag="B, 0">
                                            </telerik:RadMenuItem>
                                            <telerik:RadMenuItem Header="Arrived"  Tag="R, 1">
                                            </telerik:RadMenuItem>
                                            <telerik:RadMenuItem Header="Partially Arrived"  Tag="R, 2">
                                            </telerik:RadMenuItem>
                                            <telerik:RadMenuItem Header="Confirmed"  Tag="R, 6">
                                            </telerik:RadMenuItem>
                                            <telerik:RadMenuItem Header="On Way"  Tag="R, 7">
                                            </telerik:RadMenuItem>
                                            <telerik:RadMenuItem Header="Left Message"  Tag="R, 8">
                                            </telerik:RadMenuItem>
                                        </telerik:RadContextMenu>
                                    </telerik:RadContextMenu.ContextMenu>
                                    <Image Source="../../Assets/images/TimeSlotAction.png" Height="15" Width="15" />
                                </Button>
                            </DataTemplate>
                        </telerik:GridViewDataColumn.CellTemplate>
                    </telerik:GridViewDataColumn>

[Vlad]

Hi,

 Indeed with Q1 2011 we optimized the grid cells creation greatly - you can check for example this demo where the grid is bound to 1 mil. records with 1000 columns. You can check grouping examples as well. 

Regards,
Vlad
the Telerik team