Listbox Image Binding Is Slow and Freezes UI

[xDreamms]

Description

 public static async Task<BitmapImage> GetImage(string url,ImageType imageType)
 {
     var bitmapImage = new BitmapImage(new Uri(url,UriKind.Absolute));
     return bitmapImage;
}

<ListBox  ScrollViewer.CanContentScroll="True" MaxHeight="500" 
   VirtualizingPanel.IsVirtualizing="true" 
   VirtualizingPanel.VirtualizationMode="Recycling" ItemsSource="{Binding PopularMovies, Mode=OneWay, IsAsync=True}"  Grid.Row="3" Grid.Column="1" Grid.ColumnSpan="2" SelectionChanged="MoviesDisplay_OnSelectionChanged" ScrollViewer.ScrollChanged="MoviesDisplay_OnScrollChanged"  ScrollViewer.HorizontalScrollBarVisibility="Visible" ScrollViewer.VerticalScrollBarVisibility="Disabled" Background="Transparent" x:Name="MoviesDisplay">

     <b:Interaction.Behaviors>
         <local:IgnoreMouseWheelBehavior />
     </b:Interaction.Behaviors>
     <ItemsControl.Resources>
         <Style x:Key="ScaleStyle" TargetType="Image">
             <Style.Triggers>
                 <Trigger Property="IsMouseOver" Value="True">
                     <Setter Property="Grid.ZIndex" Value="1"/>
                     <Setter Property="RenderTransform">
                         <Setter.Value>
                             <ScaleTransform ScaleX="1.1" ScaleY="1.1"/>
                         </Setter.Value>
                     </Setter>
                 </Trigger>
             </Style.Triggers>
         </Style>
     </ItemsControl.Resources>
     <ListBox.ItemContainerStyle>
         <Style TargetType="ListBoxItem">
             <Setter Property="IsSelected" Value="{Binding Content.IsSelected, Mode=TwoWay, RelativeSource={RelativeSource Self}}"/>
             <Setter Property="Template">
                 <Setter.Value>
                     <ControlTemplate TargetType="ListBoxItem">
                         <ContentPresenter/>
                     </ControlTemplate>
                 </Setter.Value>
             </Setter>
         </Style>
     </ListBox.ItemContainerStyle>
     <ListBox.ItemTemplate>
         <DataTemplate>
             <Grid Cursor="Hand" Margin="0 0 20 0" >
                 <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="*"></ColumnDefinition>
                 </Grid.ColumnDefinitions>
                 <Grid.RowDefinitions>
                     <RowDefinition Height="*"></RowDefinition>
                     <RowDefinition Height="0.052*"></RowDefinition>
                     <RowDefinition Height="0.05*"></RowDefinition>
                 </Grid.RowDefinitions>

                 <Viewbox HorizontalAlignment="Left" Grid.Row="0" Grid.Column="0">
                     <Image RenderTransformOrigin="0.5,0.5" Style="{StaticResource ScaleStyle}"  Source="{Binding Bitmap, UpdateSourceTrigger=PropertyChanged, Mode=OneWay}"></Image>
                 </Viewbox>

                 <Viewbox MaxWidth="200" HorizontalAlignment="Left" Grid.Row="1">
                     <TextBlock   TextWrapping="Wrap" Text="{Binding Name, UpdateSourceTrigger=PropertyChanged}" Foreground="White"></TextBlock>
                 </Viewbox>

                 <Grid Grid.Row="2" Grid.Column="0">
                     <Grid.ColumnDefinitions>
                         <ColumnDefinition Width="0.3*"></ColumnDefinition>
                         <ColumnDefinition Width="*"></ColumnDefinition>
                     </Grid.ColumnDefinitions>

                     <Viewbox HorizontalAlignment="Left">
                         <materialDesign:RatingBar
 x:Name="ReadOnlyRatingBar"
 IsReadOnly="True"
 Value="{Binding Rating, UpdateSourceTrigger=PropertyChanged}"></materialDesign:RatingBar>
                     </Viewbox>

                     <Viewbox Margin="10 0 0 0" Grid.Column="1" HorizontalAlignment="Left">
                         <TextBlock Text="{Binding RatingNumber, UpdateSourceTrigger=PropertyChanged}" Foreground="#767676"></TextBlock>
                     </Viewbox>
                 </Grid>
             </Grid>
         </DataTemplate>
     </ListBox.ItemTemplate>
     <ListBox.ItemsPanel>
         <ItemsPanelTemplate>
             <VirtualizingStackPanel VirtualizingStackPanel.IsVirtualizing="True"  VirtualizingStackPanel.VirtualizationMode="Recycling" IsItemsHost="True" Orientation="Horizontal"  />
         </ItemsPanelTemplate>
     </ListBox.ItemsPanel>
 </ListBox>

public static async Task GetPopularMoviesAsync(string language, int page)
{
    PopularMovies.Clear();
    var popularMovies = await client.GetMoviePopularListAsync(language, page);
    foreach (var movie in popularMovies.Results)
    {
        Movie mov = new Movie()
        {
            Bitmap = await GetImage(client.GetImageUrl("w500", movie.PosterPath).AbsoluteUri,ImageType.Poster),
            Id = movie.Id,
            Name = movie.Title,
            Rating = movie.VoteAverage,
            RatingNumber = movie.VoteAverage.ToString(),
            ShowType = ShowType.Movie,
        };
        if (PopularMovies.Any(x => x.Id == movie.Id))
        {

        }
        else
        {
            PopularMovies.Add(mov);
        }
    }
}

It is slow and freezes UI. Btw I am using https://github.com/jellyfin/TMDbLib. And I read and applied this article: But still slow https://github.com/RickStrahl/BlogPosts/blob/master/2024-01/Working%20around%20the%20WPF%20Image%20Control%20Blues/WorkingAroundWPFImageControlBlues.md Btw my 2018 project .net 4.7.2 with same codes runs very fast. What did you change in ImageControl?

Expected behavior

It should work without freezes and fast

Actual behavior

Slow and Freezes UI

[miloush]

I don't think anything was changed in the Image class. Do you have a repro project?