WPF的ListBox加载大量图片卡死的有关问题

WPF的ListBox加载大量图片卡死的问题
问题如下：ListBox的Itemplate是我自己定义的usercontrol，每个usercontrol都有一个image，当加载listbox的时候（大概有200个左右usercontrol）会很慢，而且加载完成之后移动鼠标或者滚轮都会造成卡死！！
ListBox代码定义如下：

  <ListBox Grid.Column="1" Grid.Row="1" Name="_MonitorDisplayArea" 

                         ScrollViewer.HorizontalScrollBarVisibility="Disabled"

                         VirtualizingStackPanel.IsVirtualizing="True" 

                         VirtualizingStackPanel.VirtualizationMode="Recycling"

                         ScrollViewer.CanContentScroll="False">

                    <ListBox.CacheMode>

                        <BitmapCache    EnableClearType="False" 

                                            RenderAtScale="1" 

                                            SnapsToDevicePixels="False"/>

                    </ListBox.CacheMode>

                    <ListBox.ItemsPanel>

                        <ItemsPanelTemplate>

                            <WrapPanel/>

                        </ItemsPanelTemplate>

                    </ListBox.ItemsPanel>

                    <ListBox.ItemTemplate>

                        <DataTemplate>

                            <local:MonitorState />

                        </DataTemplate>

                    </ListBox.ItemTemplate>

                </ListBox>