Very long time on 10000 points

[Raphael]

Hi !

I'm trying telerik charts and I wanted to test the performance. I saw the sample with 15000 points and I wanted to do the same with much more. Unfortunately, my computer got very hard to print a 10000 points line. I guess something is wrong with my code compared to the sample one but I don't really realise what.

class DataListViewModel : ViewModelBase
{
    private RadObservableCollection<int> dataList;
    private Random random = new Random((int) DateTime.Now.Ticks);

    public DataListViewModel()
    {
        this.Data = this.FillRandomlyList();
    }

    public RadObservableCollection<int> Data
    {
        get { return dataList; }
        set
        {
            if (value != dataList)
            {
                dataList = value;
                this.OnPropertyChanged("Data");
            }
        }
    }

    private RadObservableCollection<int> FillRandomlyList()
    {
        var res = new RadObservableCollection<int>();

        for (int i = 0; i < 10000; i++)
        {
            res.Add(random.Next(500));
        }

        return res;
    }
}

<Window x:Class="PerfTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation">
    <Grid>
        <telerik:RadCartesianChart Margin="12,12,270,12">
            <telerik:RadCartesianChart.Grid>
                <telerik:CartesianChartGrid MajorLinesVisibility="XY" MajorXLineDashArray="5, 5" MajorYLineDashArray="5, 5">
                    <telerik:CartesianChartGrid.MajorXLineStyle>
                        <Style TargetType="Line">
                            <Setter Property="Shape.Stroke" Value="Gray" />
                        </Style>
                    </telerik:CartesianChartGrid.MajorXLineStyle>
                    <telerik:CartesianChartGrid.MajorYLineStyle>
                        <Style TargetType="Line">
                            <Setter Property="Shape.Stroke" Value="Gray" />
                        </Style>
                    </telerik:CartesianChartGrid.MajorYLineStyle>
                </telerik:CartesianChartGrid>
            </telerik:RadCartesianChart.Grid>


            <telerik:RadCartesianChart.HorizontalAxis>
                <telerik:LinearAxis Visibility="Hidden"/>
            </telerik:RadCartesianChart.HorizontalAxis>

            <telerik:RadCartesianChart.VerticalAxis>
                <telerik:CategoricalAxis Title="Test2" Visibility="Visible" IsInverse="True" />
            </telerik:RadCartesianChart.VerticalAxis>


            <telerik:RadCartesianChart.Behaviors>
                <telerik:ChartPanAndZoomBehavior />
                <telerik:ChartSelectionBehavior />
            </telerik:RadCartesianChart.Behaviors>


            <telerik:RadCartesianChart.Series>
                <telerik:LineSeries Stroke="IndianRed" CategoryBinding="X" ValueBinding="Y"
                                    ItemsSource="{Binding Path=Data}" RenderMode="Light" >
                    <telerik:LineSeries.PointTemplate>
                        <DataTemplate>
                            <Ellipse Fill="DeepPink" Height="5" Width="5" />
                        </DataTemplate>
                    </telerik:LineSeries.PointTemplate>
                </telerik:LineSeries>
            </telerik:RadCartesianChart.Series>
        </telerik:RadCartesianChart>
    </Grid>
</Window>

Does someone have an idea ?
Thank you !

Edit : It does the same without PointTemplate

[Petar Kirov]

Hi Raphael,

Thanks for the attached code. I was able to quickly reproduce the issue.

The main performance hit you are experiencing is caused by the excessive number of axis ticks and labels that are being generated. You can control this number by the MajorStep (for the LinearAxis) and 
MajorTickInterval (for the CategoricalAxis) properties. A suitable number for your test dataset is 1000.

The second hit is actually caused by the PointTemplates. Most probably you did not notice it because, the Ticks/Labels problem had a much larger impact. 

Give these recommendations a try and let us know how it goes.
 
Regards,
Petar Kirov
the Telerik team