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I have a Windows Forms app, that has a single ElementHost containing a WPF UserControl... in my WPF, I have a VERY simple ListView: <ListView Margin="4" ItemsSource="{Binding Notifications}"> <ListView.View> <GridView> <GridViewColumn Header="FirstName" DisplayMemberBinding="{Binding FirstName}" /> <GridViewColumn Header="LastName" DisplayMemberBinding="{Binding LastName}" /> <GridViewColumn Header="Address" DisplayMemberBinding="{Binding Address}" /> <GridViewColumn Header="City" DisplayMemberBinding="{Binding City}" /> <GridViewColumn Header="State" DisplayMemberBinding="{Binding State}" /> <GridViewColumn Header="Zip" DisplayMemberBinding="{Binding Zip}" /> </GridView> </ListView.View> </ListView> If my source has 10 items, the form loads in less than one second. If my source has 1000 items, it takes 7 seconds!!! My timer is ONLY taking the loading into account (not how much time it takes to get the items). So my question is: Is using an ElementHost a performance nightmare? Is WPF DataBinding a performance nightmare? Is the ListView a piece of crap? (btw, same results with the WPFToolkit's DataGrid)?

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