如何在不冻结c#显示的情况下绘制100到1000个基本形状

using System;
using System.Drawing;
using System.Windows.Forms;

public class DoubleBufferedForm : Form
{
    private const int ShapeCount = 500; // 可以根据需要调整形状数量

    public DoubleBufferedForm()
    {
        this.DoubleBuffered = true; // 启用双缓冲
        this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
        this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
        this.SetStyle(ControlStyles.UserPaint, true);
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);
        Random rand = new Random();

        for (int i = 0; i < ShapeCount; i++)
        {
            int x = rand.Next(this.ClientSize.Width);
            int y = rand.Next(this.ClientSize.Height);
            int width = rand.Next(20, 50);
            int height = rand.Next(20, 50);
            Color color = Color.FromArgb(rand.Next(256), rand.Next(256), rand.Next(256));

            using (SolidBrush brush = new SolidBrush(color))
            {
                e.Graphics.FillRectangle(brush, x, y, width, height);
            }
        }
    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new DoubleBufferedForm());
    }
}