Avalonia/samples/ControlCatalog/Pages/NavigationPage/NavigationPagePerformancePage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="ControlCatalog.Pages.NavigationPagePerformancePage">
  <Grid ColumnDefinitions="*,240">

    <!-- Left: NavigationPage + Operation log -->
    <DockPanel Grid.Column="0" Margin="12">

      <DockPanel DockPanel.Dock="Bottom" Height="130" Margin="0,8,0,0">
        <DockPanel DockPanel.Dock="Top" Margin="0,0,0,4">
          <TextBlock Text="Operation Log"
                     FontSize="12" FontWeight="SemiBold"
                     VerticalAlignment="Center" />
          <Button x:Name="ClearLogButton" Content="Clear"
                  FontSize="11" Padding="8,2"
                  HorizontalAlignment="Right"
                  Click="OnClearLog" />
        </DockPanel>
        <Border BorderBrush="{DynamicResource SystemControlForegroundBaseMediumLowBrush}"
                BorderThickness="1" CornerRadius="4" ClipToBounds="True">
          <ScrollViewer x:Name="LogScrollViewer">
            <StackPanel x:Name="LogPanel" Spacing="0" />
          </ScrollViewer>
        </Border>
      </DockPanel>

      <Border BorderBrush="{DynamicResource SystemControlForegroundBaseMediumLowBrush}"
              BorderThickness="1" CornerRadius="6" ClipToBounds="True">
        <NavigationPage x:Name="DemoNav" />
      </Border>
    </DockPanel>

    <!-- Right: Metrics + Actions -->
    <Border Grid.Column="1"
            BorderBrush="{DynamicResource SystemControlForegroundBaseMediumLowBrush}"
            BorderThickness="1,0,0,0" Padding="12">
      <ScrollViewer>
        <StackPanel Spacing="8">

          <TextBlock Text="Metrics" FontWeight="SemiBold" />
          <TextBlock x:Name="StackDepthText"    Text="Stack Depth: 0"        FontSize="12" />
          <TextBlock x:Name="LiveInstancesText" Text="Live Page Instances: 0" FontSize="12" />
          <TextBlock x:Name="TotalCreatedText"  Text="Total Pages Created: 0" FontSize="12" />
          <DockPanel>
            <TextBlock x:Name="ManagedMemoryText" Text="Managed Heap: 0.0 MB" FontSize="12" />
            <TextBlock x:Name="MemoryDeltaText"   Text=""
                       FontSize="12" FontWeight="SemiBold" Margin="6,0,0,0" />
          </DockPanel>
          <TextBlock x:Name="LastOpTimeText"     Text="Last Op: —"            FontSize="12" />

          <Separator />

          <TextBlock Text="Actions" FontWeight="SemiBold" />
          <Button Content="Push Page"     HorizontalAlignment="Stretch" Click="OnPush" />
          <Button Content="Push 5 Pages"  HorizontalAlignment="Stretch" Click="OnPush5" />
          <Button Content="Pop Page"      HorizontalAlignment="Stretch" Click="OnPop" />
          <Button Content="Pop to Root"   HorizontalAlignment="Stretch" Click="OnPopToRoot" />

          <Separator />

          <Button x:Name="ForceGCButton" Content="Force GC + Refresh"
                  HorizontalAlignment="Stretch"
                  Click="OnForceGC" />

          <CheckBox x:Name="AutoRefreshCheck" Content="Auto-refresh (2s)"
                    FontSize="12"
                    IsCheckedChanged="OnAutoRefreshChanged" />

          <Separator />

          <TextBlock Text="Stack" FontWeight="SemiBold" />
          <TextBlock Text="▲  Current (top)" FontSize="10" Opacity="0.45" Margin="0,-2,0,0" />
          <StackPanel x:Name="StackItemsPanel" Spacing="4" />
          <TextBlock Text="▼  Root (bottom)" FontSize="10" Opacity="0.45" />

        </StackPanel>
      </ScrollViewer>
    </Border>

  </Grid>
</UserControl>