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I'm creating an animated slide transition in Java, and it is choppy on my current model MacBook Pro and on my year-old iMac, on Java 6, 7, and 8. What can I do to make this animation appear smoother to the user on Mac OS X? import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class ScratchSpace { public static void main(String[] args) { AnimatedPanel panel = new AnimatedPanel(); JFrame frame = new JFrame(); frame.setContentPane(panel); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); panel.animate(); } public static class AnimatedPanel extends JPanel { private float progress = 0.0f; // a number between 0.0 and 1.0 public AnimatedPanel() { setPreferredSize(new Dimension(800, 600)); setOpaque(true); } public void animate() { final int animationTime = 1000; int framesPerSecond = 30; int delay = 1000 / framesPerSecond; final long start = System.currentTimeMillis(); final Timer timer = new Timer(delay, null); timer.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { final long now = System.currentTimeMillis(); final long elapsed = now - start; progress = (float) elapsed / animationTime; repaint(); if (elapsed >= animationTime) { timer.stop(); } } }); timer.start(); } @Override protected void paintComponent(Graphics g) { Graphics2D g2d = (Graphics2D) g; int width = getWidth(); int progressWidth = (int) (width * progress); g2

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