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POIs this slow WPF TextBlock performance expected?
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  1. POIs this slow WPF TextBlock performance expected?
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    copied!<p>I am doing some benchmarking to determine if I can use WPF for a new product. However, early performance results are disappointing. I made a quick app that uses data binding to display a bunch of random text inside of a list box every 100 ms and it was eating up ~15% CPU. So I made another quick app that skipped the data binding/data template scheme and does nothing but update 10 TextBlocks that are inside of a ListBox every 100 ms (the actual product wouldn't require 100 ms updates, more like 500 ms max, but this is a stress test). I'm still seeing ~5-10% CPU usage. Why is this so high? Is it because of all the garbage strings?</p> <p>Here's the XAML for the version that doesn't use binding:</p> <pre><code>&lt;Grid&gt; &lt;ListBox x:Name="numericsListBox"&gt; &lt;ListBox.Resources&gt; &lt;Style TargetType="TextBlock"&gt; &lt;Setter Property="FontSize" Value="48"/&gt; &lt;Setter Property="Width" Value="300"/&gt; &lt;/Style&gt; &lt;/ListBox.Resources&gt; &lt;TextBlock/&gt; &lt;TextBlock/&gt; &lt;TextBlock/&gt; &lt;TextBlock/&gt; &lt;TextBlock/&gt; &lt;TextBlock/&gt; &lt;TextBlock/&gt; &lt;TextBlock/&gt; &lt;TextBlock/&gt; &lt;TextBlock/&gt; &lt;/ListBox&gt; &lt;/Grid&gt; </code></pre> <p>Here's the code behind:</p> <pre><code>public partial class Window1 : Window { private int _count = 0; public Window1() { InitializeComponent(); } private void OnLoad(object sender, RoutedEventArgs e) { var t = new DispatcherTimer(TimeSpan.FromSeconds(0.1), DispatcherPriority.Normal, UpdateNumerics, Dispatcher); t.Start(); } private void UpdateNumerics(object sender, EventArgs e) { ++_count; foreach (object textBlock in numericsListBox.Items) { var t = textBlock as TextBlock; if (t != null) t.Text = _count.ToString(); } } } </code></pre> <p>That consumes ~5-10% CPU according to Task Manager, or up to about 20% of one of the cores! Any ideas for a better way to quickly render text?</p> <p>My computer: XP SP3, 2.26 GHz Core 2 Duo, 4 GB RAM, Intel 4500 HD integrated graphics. And that is an order of magnitude beefier than the hardware I'd need to develop for in the real product.</p>
 

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