使用键盘移动图片框时如何摆脱滞后

Question

您好我成功制作了一个通过按键移动图片框的程序，但是图片框的移动并不平滑，当您第一次开始移动图片框时会出现延迟。

这是我的代码

namespace Imagebox_test1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.KeyPreview = true;
            this.KeyDown += Form1_KeyDown;

        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            int x = pictureBox1.Location.X;
            int y = pictureBox1.Location.Y;

            bool player_left;
            bool player_right;

            player_left = false;
            player_right = false;

            int move_speed;
            move_speed = 10;

            switch (e.KeyCode)
            {
                case Keys.A:
                    player_right = false;
                    player_left = true;
                    break;
                case Keys.D:
                    player_right = true;
                    break;
            }

            if (player_left == true) x -= move_speed; 
            if (player_right == true) x += move_speed;

            pictureBox1.Location = new Point(x, y);
        }
    }

}

如何摆脱这种滞后并使运动更顺畅？

非常感谢。