WPF动画FPS vs. CPU使用率-我是不是期望太高了？

<Window x:Class="WpfAnimationDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Ellipse Fill="Blue" Width="100" Height="100">
            <Ellipse.Triggers>
                <EventTrigger RoutedEvent="Ellipse.Loaded">
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimation
                                Storyboard.TargetProperty="(Ellipse.RenderTransform).(RotateTransform.Angle)"
                                From="0" To="360"
                                Duration="0:0:2"
                                RepeatBehavior="Forever"/>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Ellipse.Triggers>
            <Ellipse.RenderTransform>
                <RotateTransform CenterX="50" CenterY="50"/>
            </Ellipse.RenderTransform>
        </Ellipse>
    </Grid>
</Window>