in wpf listbox some-more 1000 settlement equipment wizz images spin slow

i met problem deveoping imitation spectator application.
i listbox arrangement images, contained observablecollection.
i bond listbox's itemssource observablecollection.

  <datatemplate datatype="{x:type modeldata:imageinfo}">
        <image 
            margin="6"
            source="{binding thumbnail}"
            width="{binding zoombarwidth.width, source={staticresource zoombarmanager}}"
            height="{binding zoombarwidth.width, source={staticresource zoombarmanager}}"/>
  </datatemplate>

<grid datacontext="{staticresource imageinfolder}">
    <scrollviewer
        verticalscrollbarvisibility="auto" 
        horizontalscrollbarvisibility="disabled">
        <listbox name="photoslistbox"
            issynchronizedwithcurrentitem="true"
            style="{staticresource photolistboxstyle}" 
            margin="5"
            selectionmode="extended" 
            itemssource="{binding}" 
           />
    </scrollviewer>

i also bond image'height listbox slider.(the slider's value also bond zoombarmanager.zoombarwidth.width).
but i found collection spin larger, such as: contains some-more following 1000 images, i slider change distance iamges, spin bit slow.
my doubt is.
1. since spin slow? spin tries wizz each images,or only since notify("width") invoked some-more 1000 times.
2. there any slight solve kind problem faster.

the photolistboxstyle this:

    <style~~ targettype="{x:type listbox}" x:key="photolistboxstyle">
        <setter property="foreground" value="white" />
        <setter property="template">
            <setter.value>
                <controltemplate targettype="{x:type listbox}" >
                    <wrappanel 
                        margin="5" 
                        isitemshost="true" 
                        orientation="horizontal" 
                        verticalalignment="top"                             
                        horizontalalignment="stretch" />
                </controltemplate>
            </setter.value>
        </setter>
    </style~~>

but i impression above, i have scrollviewer outmost listbox, differently i have thought well-spoken scrolling scrollerbar wrappanel seems have default scrollerbar. anyone help? conspicuous listbox scrollviewer bad performance.