你好，我正在做一个简单的突破游戏与windows窗体在visual studio中。我注意到游戏运行很糟糕，当游戏计时器设置在20以下，当一个背景图像被添加，它降低了性能，甚至移动。移动对象口吃，当2个对象同时移动，他们都慢下来。
我试过多个图像，图像越大，性能下降越大
下面是我的代码

// Variables
int playerSpeed;
int score;
bool moveLeft;
bool moveRight;
int deflection;
int ballBaseSpeed;
int ballXSpeed;
int ballYSpeed;
int difficulty = 1;

public Form2()
{
    InitializeComponent();
}

private void setupGame()
{
    playerSpeed = 7 * difficulty;
    score = 0;
    moveLeft = false;
    moveRight = false;
    deflection = 0;
    ballBaseSpeed = 5 * difficulty;
    ballXSpeed = ballBaseSpeed;
    ballYSpeed = ballBaseSpeed;
    gameTimer.Start();
}

private void gamerTimerEvent(object sender, EventArgs e)
{
    // Player Move
    if (moveRight & player.Left < 784 - player.Width)
    {
        player.Left += playerSpeed;
    }
    if (moveLeft & player.Left > 0)
    {
        player.Left -= playerSpeed;
    }
    // Ball Collisions
    if (ball.Top < 0)
    {
        ballYSpeed *= -1;
        ball.Top = 0;
    } else if (ball.Top > 461 - ball.Height)
    {
        gameTimer.Stop();
    }
    if (ball.Left < 0) 
    {
        ballXSpeed *= -1;
        ball.Left = 0;
    } else if (ball.Left > 784 - ball.Width)
    {
        ballXSpeed *= -1;
        ball.Left = 784 - ball.Width;
    }
    if (ball.Bounds.IntersectsWith(player.Bounds))
    {
        // Calculates how much extra speed to add depending on where the ball lands on the paddle
        deflection = ((((player.Left + (player.Width / 2) - ball.Width / 2) - ball.Left) * -1) / 10);
        // If ball is on right side and travelling left then the ball direction swaps
        if (deflection > 0 & ballXSpeed < 0) 
        {
            ballXSpeed *= -1;
        // If ball is on left side and travelling right then the ball direction swaps
        } else if (deflection < 0 & ballXSpeed > 0)
        {
            ballXSpeed *= -1;
        }
        ballYSpeed *= -1;
        // Resets ball speed to minimum and calculates the extra speed needed due to paddle position
        if (ballXSpeed > 0)
        {
            ballXSpeed = ballBaseSpeed + deflection;
        } else if (ballXSpeed < 0)
        {
            ballXSpeed = (ballBaseSpeed * -1) + deflection;
        }
    }
    // Ball Movement
    ball.Left += ballXSpeed;
    ball.Top -= ballYSpeed;

    // Blocks Collisions
    foreach(Control x in this.Controls)
    {
        if (x is PictureBox && (string)x.Tag == "blocks")
        {
            if (ball.Bounds.IntersectsWith(x.Bounds)) {
                this.Controls.Remove(x);
                ballYSpeed *= -1;
                score += 1;
            }
        }
    }

    // Display and updating text
    scoreLabel.Text = ("Score: " + score.ToString());

}

private void keyIsDown(object sender, KeyEventArgs e)
{
    // Player Controls
    if (e.KeyCode == Keys.Right)
    {
        moveRight = true;
    }
    if (e.KeyCode == Keys.Left)
    {
        moveLeft = true;
    }
}

private void keyIsUp(object sender, KeyEventArgs e)
{
    // Player Controls
    if (e.KeyCode == Keys.Right)
    {
        moveRight = false;
    }
    if (e.KeyCode == Keys.Left)
    {
        moveLeft = false;
    }
}

private void startButton_Click(object sender, EventArgs e)
{
    setupGame();
    startButton.Hide();
    easyButton.Hide();
    hardButton.Hide();
    startButton.Enabled = false;
    easyButton.Enabled = false;
    hardButton.Enabled = false;
}

private void hardButton_Click(object sender, EventArgs e)
{
    difficulty = 2;
}

private void easyButton_Click(object sender, EventArgs e)
{
    difficulty = 1;
}