Slow datagrid with ~400 rows

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WPF

DataGrid

C#6.0

HI,

i have a very slow ItemsControl with up to 5 DataGrids in it. (displays next to each other) Everytime when i update this Control my whole UI lags extremly (~10sec). Each Datagrid has ~50-400 items with predifined columns (not autogenerated). The itemsources of the grids get updated at the same time.

Here is my XAML:

<pre>        <ScrollViewer Grid.Row="1">
            <ItemsControl ItemsSource="{Binding}">
                <ItemsControl.ItemsPanel>
                    <ItemsPanelTemplate>
                        <UniformGrid Columns="{Binding Count}"/>
                    </ItemsPanelTemplate>
                </ItemsControl.ItemsPanel>
                <ItemsControl.ItemTemplate>
                    <DataTemplate>
                        <DataGrid ItemsSource="{Binding Content}" RowHeight="20" AutoGenerateColumns="False" VirtualizingPanel.IsVirtualizing="True" VirtualizingPanel.VirtualizationMode="Recycling">
                            <DataGrid.Columns>
                                <DataGridTextColumn Header="name" Binding="{Binding Name}" Width="100"  />
                                <DataGridTextColumn Header="value" Binding="{Binding Value}" Width="50" />
                            </DataGrid.Columns>
                        </DataGrid>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
        </ScrollViewer>

And here the Code Behind:

public partial class MainWindow : Window
   {

       public List<Folder> Folders { get; set; }

       public MainWindow()
       {
           InitializeComponent();

           Folders = new List<Folder>();
           Folders.Add(new Folder());
           Folders.Add(new Folder());

           this.DataContext = Folders;
       }

       private void Button_Click(object sender, RoutedEventArgs e)
       {
           Folders.ForEach(f => f.UpdateData());
       }
   }


   public class Folder
   {
       private  Random _rand = new Random();
       public ObservableCollection<Content> Content { get; set; }

       public Folder()
       {
           Content = new ObservableCollection<Content>();
       }

       public void UpdateData()
       {
           Content.Clear();
           for(int i = 1; i <= 300; i++)
               Content.Add(new Content($"C{i}", _rand.Next(1,400)));
       }
   }

   public class Content
   {
       public string Name  { get; set; }
       public int Value    { get; set; }

       public Content(string name, int value)
       {
           Name    = name;
           Value   = value;
       }
   }

Pls find also attached a full working example here.

Any ideas how i can speed up the datagrids without blocking the whole UI?

KR Manu

What I have tried:

I have tried to replace the datagrids with listboxes but the UI is still blocking.
Well it's not blocking that long but i need a solution without blocking at all.