如何提高重绘速度？

Question

我正在尝试使用我的鼠标制作一个可重复调整大小的方框，但是如果我快速拖动鼠标，则非常明显的是它偏离应该的位置，例如http://imgur.com/a/sglGv（红色应该是它的位置，黑色就是它的所在。）

using System.Drawing;
using System.Windows.Forms;
using System;
using System.Drawing.Drawing2D;

namespace WindowsFormsApp6
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
            TransparencyKey = Color.SaddleBrown;
            canvas.MouseDown += new MouseEventHandler(canvas_MouseDown);
            canvas.MouseUp += new MouseEventHandler(canvas_MouseUp);
            canvas.MouseMove += new MouseEventHandler(canvas_MouseMove);
            Load += new EventHandler(Form1_Load);
            //typeof(Panel).InvokeMember("DoubleBuffered", BindingFlags.SetProperty| BindingFlags.Instance | BindingFlags.NonPublic, null,canvas, new object[] { true });

        }
        private Bitmap m_OriginalImage = null;
        private int X0, Y0, X1, Y1;
        private bool SelectingArea = false;
        private Bitmap SelectedImage = null;
        private Graphics SelectedGraphics = null;

        private void Form1_Load(object sender, EventArgs e)
        {
            m_OriginalImage = new Bitmap(canvas.Image);
            KeyPreview = true;
        }

        private void canvas_MouseDown(object sender, MouseEventArgs e)
        {
            SelectingArea = true;
            X0 = e.X;
            Y0 = e.Y;

            SelectedImage = new Bitmap(m_OriginalImage);
            SelectedGraphics = Graphics.FromImage(SelectedImage);
            canvas.Image = SelectedImage;
        }


        private void canvas_MouseMove(object sender, MouseEventArgs e)
        {
            if (!SelectingArea) return;

            X1 = e.X;
            Y1 = e.Y;

            SelectedGraphics.DrawImage(m_OriginalImage, 0, 0);

            using (Pen select_pen = new Pen(Color.Red))
            {
                select_pen.DashStyle = DashStyle.Dash;
                Rectangle rect = MakeRectangle(X0, Y0, X1, Y1);
                //ControlPaint.DrawReversibleFrame(rect,this.BackColor, FrameStyle.Dashed);
                SelectedGraphics.DrawRectangle(select_pen, rect);
            }
            canvas.Refresh();
            }
        private void canvas_MouseUp(object sender, MouseEventArgs e)
        {
            if (!SelectingArea) return;

            SelectingArea = false;
            SelectedImage = null;
            SelectedGraphics = null;
            canvas.Image = m_OriginalImage;
            canvas.Refresh();

            Rectangle rect = MakeRectangle(X0, Y0, X1, Y1);
            if ((rect.Width > 0) && (rect.Height > 0))
            {
                MessageBox.Show(rect.ToString());
            }
        }
        private Rectangle MakeRectangle(int x0, int y0, int x1, int y1)
        {
            return new Rectangle(
                Math.Min(x0, x1),
                Math.Min(y0, y1),
                Math.Abs(x0 - x1),
                Math.Abs(y0 - y1));
        }
    }
}

我已经尝试了从计时器到线程的所有想法。

任何保持60 fps的建议都会受到重视。