Hi.

We are using large XamGrid. And we have performance problems.
I create Sample. (@v13.1 XamGrid.)

<Grid x:Name="LayoutRoot" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="30"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal">
<TextBlock Text="Rows" VerticalAlignment="Center"></TextBlock>
<TextBox x:Name="maxcol" Text="40" VerticalAlignment="Center"></TextBox>
<TextBlock Text="Columns" VerticalAlignment="Center"></TextBlock>
<TextBox x:Name="maxrow" Text="40" VerticalAlignment="Center"></TextBox>
<Button x:Name="button" Width="110">Refresh</Button>
<TextBlock x:Name="res" Width="110" VerticalAlignment="Center"></TextBlock>
</StackPanel>
<ig:XamGrid x:Name="grid"
Grid.Row="1"
AutoGenerateColumns="False"
HeaderRowHeight="Dynamic"
Width="1600"
Height="730">
<ig:XamGrid.Columns>
</ig:XamGrid.Columns>
</ig:XamGrid>
</Grid>

void button_Click(object sender, RoutedEventArgs e)
{

  //Clear Defenision
  this.grid.Columns.Clear();
  foreach (var x in this.grid.Rows)
  {
    this.grid.Rows.Remove(x);
  }

  var cnt = int.Parse(this.maxcol.Text);

  //Create test columns
  for (var i = 0; i < cnt; i++)
  {
    var col = new TextColumn();
    col.IsReadOnly = true;

    col.Key = "[Column" + i.ToString() + "]";
    col.Width = new ColumnWidth(60, false);
    this.grid.Columns.Add(col);
  }

  //Create test rows
  var resource = new ObservableCollection<Dictionary<string,object>>();
  var cntrow = int.Parse(this.maxrow.Text);
  for (var i = 0; i < RowCountSetting; i++)
  {
    var item = new Dictionary<string, object>();
    for (var j = 0; j < cntrow; j++)
    {
      item.Add("Column" + j.ToString(), "test");
    }
    resource.Add(item);
  }
  this.grid.ItemsSource = resource;

  //Measure refresh rate
  var ticks = DateTime.Now.Ticks;
  this.UpdateLayout();
  var ellapsedMilliseconds = (DateTime.Now.Ticks - ticks) /10000;

  //Display result
  res.Text = (ellapsedMilliseconds).ToString() + "[ms]";

}

This program shows about 676 cells.

And use virtualization. but takes time to refresh.(over 1000ms)

Shoud I reduce cells?

Please tell me how gain refresh rate.