如何提高JPanel的重绘频率？

我有一个简单的程序，绘制从原点以特定速度和角度发射的粒子的轨迹。我创建了一个JPanel的子类来处理这个图。每次我的子类都重新绘制，它会以当前时间和初始时间之差（以毫秒为单位），将其转换为秒，然后找到粒子应该在那个时间点的x和y坐标，最后采用这些x和y坐标并在屏幕上绘制它们。我的问题是，我的子类似乎在间隔时间似乎很长，因为只显示几个点。如何提高JPanel的重绘频率？

我的绘制方法：

private void doDrawing(Graphics g) { 

    Dimension size = getSize(); 
    Insets insets = getInsets(); 
    int w = size.width - insets.left - insets.right; 
    int h = size.height - insets.top - insets.bottom; 

    Graphics2D g2d = (Graphics2D) g; 
    g.drawString("Acceleration: -9.8m/s i", 0, 20); 
    StringBuilder b = new StringBuilder(); 
    b.append("Current Velocity: "); 
    b.append(String.valueOf(sim.getVector(tickSpeed 
      * ((System.currentTimeMillis() - initTime)/1000)).getMagnitude())); 
    b.append(" m/s at "); 
    b.append(String.valueOf(sim.getVector(tickSpeed 
      * ((System.currentTimeMillis() - initTime)/1000)).getDirection().getDirectionDeg())); 
    b.append(" degrees"); 
    g.drawString(b.toString(), 0, 30); 

    drawPreviousPoints(g2d); 

    drawCurrentPointAndAppend(g2d, w, h); 

    repaint(); 

} 

private void drawCurrentPointAndAppend(Graphics2D g2d, int w, int h) { 
    g2d.setColor(Color.red); 
    double height = (length/w) * h; 
    Vector2D c = sim.getVector(tickSpeed 
      * ((System.currentTimeMillis() - initTime)/1000)); 
    double currentX = w 
      * ((sim.getX(tickSpeed 
        * ((System.currentTimeMillis() - initTime)/1000)))/length); 
    double currentY = h 
      * (1 - ((sim.getY(tickSpeed 
        * ((System.currentTimeMillis() - initTime)/1000)))/height)); 

    g2d.drawLine((int) currentX, (int) currentY, (int) currentX, 
      (int) currentY); 
    g2d.setStroke(new BasicStroke(1, BasicStroke.CAP_SQUARE, 
      BasicStroke.JOIN_MITER)); 
    g2d.drawLine((int) currentX, (int) (currentY), 
      (int) (currentX + w * (c.getX()/length)), 
      (int) (currentY + (h * -(c.getY()/height)))); 
    xList.add(currentX); 
    yList.add(currentY); 

} 

private void drawPreviousPoints(Graphics2D g2d) { 
    g2d.setColor(Color.blue); 
    g2d.setStroke(new BasicStroke(7, BasicStroke.CAP_ROUND, 
      BasicStroke.JOIN_ROUND)); 
    if (!xList.isEmpty()) { 
     for (int i = 0; i < xList.size(); i++) { 
      g2d.drawLine(xList.get(i).intValue(), yList.get(i).intValue(), 
        xList.get(i).intValue(), yList.get(i).intValue()); 
     } 
    } 

}

tickSpeed仅仅是我使用加快或颗粒减慢的变量。它运行良好;然而，动画看起来非常波涛汹涌。