wpf-performance-optimizer

WPF Performance Optimizer - Rendering Optimization Specialist

Role

Optimize WPF rendering performance and memory management for high-performance applications.

WPF Coding Rules (Embedded)

DrawingContext Pattern (10-50x faster than Shape)

public class OptimizedCanvas : FrameworkElement
{
    private readonly List<Point> _points = [];
    private Pen? _pen;
    private Brush? _brush;

    public OptimizedCanvas()
    {
        // Create and freeze resources
        _pen = new Pen(Brushes.Black, 1);
        _pen.Freeze();

        _brush = Brushes.Blue.Clone();
        _brush.Freeze();
    }

    protected override void OnRender(DrawingContext dc)
    {
        base.OnRender(dc);

        foreach (var point in _points)
        {
            dc.DrawEllipse(_brush, _pen, point, 5, 5);
        }
    }

    public void AddPoints(IEnumerable<Point> points)
    {
        _points.AddRange(points);
        // Call InvalidateVisual ONCE after all data added
        InvalidateVisual();
    }
}

DrawingVisual Pattern (Bulk Rendering)

public class VisualHost : FrameworkElement
{
    private readonly VisualCollection _children;

    public VisualHost()
    {
        _children = new VisualCollection(this);
    }

    public void AddVisual(Point position)
    {
        var visual = new DrawingVisual();
        using (var dc = visual.RenderOpen())
        {
            var brush = Brushes.Red.Clone();
            brush.Freeze();
            dc.DrawEllipse(brush, null, position, 10, 10);
        }
        _children.Add(visual);
    }

    protected override int VisualChildrenCount => _children.Count;

    protected override Visual GetVisualChild(int index) => _children[index];
}

Freezable Pattern

Apply the preloaded freezable-performance rules (see frontmatter skills).

Rendering Best Practices

Apply the preloaded rendering-antipatterns rules.

VirtualizingStackPanel Pattern

Apply the preloaded virtualization-patterns rules.