在WPF中绘制大型彩色网格的最快方法，而无需使用第三方库？

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace WpfApp
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            // 创建绘图对象
            DrawingVisual visual = new DrawingVisual();
            using (DrawingContext context = visual.RenderOpen())
            {
                // 设置绘图属性
                Brush brush = Brushes.Red;
                Pen pen = new Pen(Brushes.Black, 1);

                // 绘制彩色网格
                int gridSize = 100; // 网格大小
                int cellSize = 10; // 单元格大小
                int rowCount = gridSize / cellSize;
                int colCount = gridSize / cellSize;

                for (int row = 0; row < rowCount; row++)
                {
                    for (int col = 0; col < colCount; col++)
                    {
                        // 计算单元格位置
                        double x = col * cellSize;
                        double y = row * cellSize;

                        // 绘制单元格
                        Rect rect = new Rect(x, y, cellSize, cellSize);
                        context.DrawRectangle(brush, pen, rect);
                    }
                }
            }

            // 将绘图对象添加到Canvas上
            Canvas canvas = new Canvas();
            canvas.Children.Add(new DrawingVisualHost(visual));
            Content = canvas;
        }
    }

    // 自定义绘图宿主类
    public class DrawingVisualHost : UIElement
    {
        private readonly Visual _visual;

        public DrawingVisualHost(Visual visual)
        {
            _visual = visual;
        }

        protected override int VisualChildrenCount => 1;

        protected override Visual GetVisualChild(int index)
        {
            return _visual;
        }
    }
}