WPF故事板滞后

Question

我用故事板动画

创建了这个Locator用户控件

<Path Stroke="#AAC2DC" StrokeThickness="1">
    <Path.Data>
        <GeometryGroup>
            <EllipseGeometry x:Name="ellipse" RadiusX="5" RadiusY="5" />
        </GeometryGroup>
    </Path.Data>
    <Path.Triggers>
        <EventTrigger RoutedEvent="Path.Loaded">
            <BeginStoryboard>
                <Storyboard AutoReverse="False" RepeatBehavior="Forever">
                    <ParallelTimeline Storyboard.TargetName="ellipse">
                        <DoubleAnimation To="60" Storyboard.TargetProperty="RadiusX" />
                        <DoubleAnimation To="60" Storyboard.TargetProperty="RadiusY" />
                    </ParallelTimeline>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Path.Triggers>
</Path>

并将其动态添加到应用的网格中。

var margin = new Thickness();
margin.Left = control.Margin.Left + control.ActualWidth / 2;
margin.Top = control.Margin.Top + control.ActualHeight / 2;
var locator = new Locator { Margin = margin };
block.Grid.Children.Add(locator);

一段时间后动画开始滞后，我不知道， 你能猜到为什么吗？

我准备了一个gif动画 animation