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    <p>Because the rendering is trivial, I find this variation of your example to be very smooth. The render time is well below a half millisecond, so the 12 millisecond period (~83 Hz) is <em>plenty</em> of time to finish a frame, typically taking less that 10% of one core. As the render time grows, the timer thread becomes saturated, and events are coalesced. The effect is magnified on a single core, as rendering competes with garbage collection and external processing demands. Java is not a real-time system, and not all schedulers are created equal.</p> <p>You'll certainly want to profile your actual code, as suggested <a href="https://stackoverflow.com/questions/5916028/how-do-i-get-appcontext-to-release-awt-components-so-they-can-be-garbage-collecte/5918785#5918785">here</a>, to see any correlation with fluctuating performance. One alternative approach is to lengthen the period (decrease the frequency) to meet your rendering deadline and use a larger increment in <code>moveImage()</code> to get the same velocity.</p> <pre><code>import java.awt.Color; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.Timer; public class Main extends JFrame { private static final int W = 800; private static final int H = 400; public Main() { super("JFrame"); this.add(new ImagePanel()); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.pack(); setSize(W, H); this.setLocationRelativeTo(null); setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { new Main(); } }); } class ImagePanel extends JPanel { Timer movementTimer; int x, y; public ImagePanel() { x = 0; y = 0; movementTimer = new Timer(12, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { moveImage(); repaint(); } }); movementTimer.start(); } public void moveImage() { x++; y++; if (x &gt; W) { x = 0; } if (y &gt; H) { y = 0; } } @Override public void paintComponent(Graphics g) { super.paintComponent(g); long start = System.nanoTime(); g.setColor(Color.RED); g.fillRect(0, 0, W, H); g.setColor(Color.BLUE); g.fillRect(x, y, 50, 50); double delta = (System.nanoTime() - start) / 1000000d; g.drawString(String.format("%1$5.3f", delta), 5, 15); } } } </code></pre>
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    1. POSwing timer - time fluctuating
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    1. UStrashgod
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    1. CO+1 (BTW - I decided to delete my answer.)
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    2. CO@Andrew Thompson I agreed with your deleted post (trashgod+1)
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    3. CO@mKorbel It was accurate in one sense, in that if you run a `Timer` every second for 86400 iterations it will 'drift' and not be 24 hours. But I think trashgod identified the real problem with the jerky animation - saturation of the core.
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