How can I tell if virtualization is actually active?

This skill includes diagnostic C# methods to check the visual tree for a VirtualizingStackPanel and count 'realized' containers to verify that only visible items are being rendered.

What does VirtualizationMode='Recycling' do?

Recycling mode reuses the same UI containers (like ListBoxItems) as the user scrolls, rather than destroying and creating new ones, which offers a massive performance boost.

Why does my WPF ListBox feel laggy with large datasets?

Lag is often caused by 'virtualization breakers' such as nesting a ListBox inside a ScrollViewer or setting CanContentScroll to false, which forces the UI to render every single item at once.

What is the primary benefit of WPF UI virtualization?

UI virtualization improves performance by only creating visual elements for items currently visible to the user, significantly reducing memory consumption and initial load times for large collections.

WPF UI Virtualization Expert

Name: WPF UI Virtualization Expert
Author: christian289

bychristian289

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Design Tools

Optimizes WPF application performance by implementing advanced UI virtualization patterns for large datasets.

About

This skill provides specialized implementation patterns for WPF UI virtualization using VirtualizingStackPanel. It enables developers to handle datasets exceeding 1,000 items in ListBox, ListView, and DataGrid controls without sacrificing UI responsiveness or memory efficiency. By providing ready-to-use XAML configurations for container recycling, pixel-based scrolling, and cache management, this skill helps identify and resolve 'virtualization breakers' like nested ScrollViewers that often cause desktop application performance bottlenecks.

Key Features

Container recycling configuration for memory efficiency
Programmatic diagnostics for verifying virtualization state
VirtualizingStackPanel implementation for high-density lists
Automated detection of virtualization-breaking layouts
6 GitHub stars
Smooth pixel-based and deferred scrolling setup

Use Cases

Optimizing data-heavy dashboards with 10,000+ records
Improving scrolling performance in complex WPF DataGrids
Troubleshooting UI lag in enterprise desktop applications

About

Key Features

Container recycling configuration for memory efficiency
Programmatic diagnostics for verifying virtualization state
VirtualizingStackPanel implementation for high-density lists
Automated detection of virtualization-breaking layouts
6 GitHub stars
Smooth pixel-based and deferred scrolling setup

Use Cases

Optimizing data-heavy dashboards with 10,000+ records
Improving scrolling performance in complex WPF DataGrids
Troubleshooting UI lag in enterprise desktop applications