FULL PRODUCT VERSION :
java version "1.6.0_11"
Java(TM) SE Runtime Environment (build 1.6.0_11-b03)
Java HotSpot(TM) Client VM (build 11.0-b16, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [version 5.1.2600]

EXTRA RELEVANT SYSTEM CONFIGURATION :
XP SP3 Family, NVIDIA GeForce 7300 LE

A DESCRIPTION OF THE PROBLEM :
First, sorry for my english, I am french.

when i using a JDesktopPane, if I call the method getGraphics() from a component linked with this (child or parent?), moving of internal frame will lag (only if setDragMode is defined to JDesktopPane.OUTLINE_DRAG_MODE).

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
See source code to reproduce this bug

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Moving the internal frame don't lagging
ACTUAL -
Moving the internal frame lagging

ERROR MESSAGES/STACK TRACES THAT OCCUR :
No error message

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.BorderLayout;

import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;


public class BugTester
{
public static void main(String[] args) throws Throwable
{
// Creation of panel
JPanel panel = new JPanel();

// Creation of internal frame
JInternalFrame internalFrame = new JInternalFrame("My child frame");
internalFrame.getContentPane().add(panel, BorderLayout.CENTER);
internalFrame.setVisible(true);
internalFrame.setLocation(20, 20);
internalFrame.setSize(300, 300);

// Creation of desktop pane
JDesktopPane destopPane = new JDesktopPane();
destopPane.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE); // IMPORTANT !!!! don't bug if not defined
destopPane.add(internalFrame);

// We show internal frame
internalFrame.setSelected(true);

// Frame
JFrame frame = new JFrame("JDesktopPane and getGraphics() bug tester");
frame.setSize(500, 500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setContentPane(destopPane);
frame.setVisible(true);

// Waiting 2000 ms
System.out.println("Waiting 2000 ms...");
Thread.sleep(2000);
System.out.println("Wait OK ! Moving the internal frame must lag now...");

// Getting graphic context from panel
panel.getGraphics();
}
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
don't using getGraphics()

Release Regression From : 6u6
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.