Question

Have TextBlock with DoubleAnimation in StoryBoard.
On Windows 7 – 1-2% CPU usage all the time.
On Windows XP SP3 – 10-15% CPU usage.

<TextBlock Grid.Column="1" Height="Auto" Margin="10,0,0,0" TextWrapping="Wrap" HorizontalAlignment="Left" VerticalAlignment="Center" PreviewMouseDown="incomMessages_SelectionChanged">
     <TextBlock.Text>
          <Binding Mode="OneTime" Converter="{StaticResource Converter}" ConverterParameter="NameAndId"/>
     </TextBlock.Text>
     <TextBlock.Style>
          <Style>    
               <Style.Triggers>
                    <DataTrigger Binding="{Binding IsNew}" Value="True">
                         <DataTrigger.EnterActions>
                              <BeginStoryboard Name="Blink">
                                   <Storyboard BeginTime="00:00:01" RepeatBehavior="Forever">
                                        <DoubleAnimation Storyboard.TargetProperty="(TextBlock.Opacity)" From="0" To="1" Duration="0:0:1" RepeatBehavior="Forever" AutoReverse="True"/>
                                    </Storyboard>
                               </BeginStoryboard>
                          </DataTrigger.EnterActions>
                     </DataTrigger>
                </Style.Triggers>
           </Style>
     </TextBlock.Style>
</TextBlock>

Am i doing something wrong or it is WPF feature?

Answer 1

You could check the RenderCapability.Tier property. It indicates the rendering tier for the current thread

RenderCapability.Tier = 0 means no graphics hardware acceleration is
available for the application on the device. All graphics features use
software acceleration.

If RenderCapability.Tier is 0 you could change the Storyboard.DesiredFrameRate property. The default value is 60 but on Windows XP you could set it lower.

For how to do you can have a look here