RadMap performance in app with high memory usage

[Shrinand]

Hi guys,

My application typically uses high amount of memory, up to 1GB in some intensive cases. My machine has 12GB memory so no problem. In intensive cases, RadMap fails to respond after panning/zooming a couple of times. When profiled, the bottleneck is in Telerik.Windows.Controls.Map.TileSource.CreateBitmap(). I tried to used caching but not much improvement. Any advice?

This is some code for mockup

<Window x:Class="RadMapPerf.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        Title="MainWindow" Height="600" Width="800">
    <Grid>
        <telerik:RadMap x:Name="RadMap" Center="38.8993487,-77.0145665" UseDefaultLayout="False" ZoomLevel="7">
            <telerik:RadMap.Provider>
                <telerik:OpenStreetMapProvider IsTileCachingEnabled="True"/>
            </telerik:RadMap.Provider>
        </telerik:RadMap>
    </Grid>
</Window>

public partial class MainWindow : Window
    {
        private readonly List<string> _memory = new List<string>();

        public MainWindow()
        {
            InitializeComponent();

            // fake memory usage
            for (var i = 0; i < 100000000; i++)
                _memory.Add("memory_usage");

        }
    }

[Petar Mladenov]

Hello Shrinand,

You can try to increase the default Cache Size which is 10 * 1024 * 1024 bytes. A possible way to achieve this is to inherit from OpenStreetMapProvider like so:

public class CustomOpenStreetProvider : OpenStreetMapProvider
{
    public CustomOpenStreetProvider() : base()
    {
        if (this.MapSources.Count == 0)
            return;

        var tiledSource = this.MapSources.ToList()[0].Value as TiledMapSource;
        if (tiledSource != null)
        {
            tiledSource.IsTileCachingEnabled = true;
            tiledSource.SetTileCacheSize(100 * 1024 * 1024);
        }
    }
}

Please let us know if this has a positive effect in your environment.

Regards,
Petar Mladenov
Telerik