A DESCRIPTION OF THE REQUEST :
With JRE 1.6.0 on Sparc Solaris 10 and the default awt.toolkit (sun.awt.X11.XToolkit),
it takes several seconds for a modal dialog (javax.swing.JDialog) to appear. The
application appears frozen during this pause.
Switching to the old motif toolkit restores the expected behavior of no pause before
modal dialogs appear.

JUSTIFICATION :
By default on JRE 1.6.0 sparc solaris, there is a several second freeze any time a modal
dialog (including JFileChooser) is opened.
JRE 1.5.0 did not exhibit this freeze behavior with either sun.awt.X11.XToolkit or
sun.awt.motif.MToolkit.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
There should be no noticable pause when opening a modal dialog.
ACTUAL -
The application freezes for several seconds before the modal dialog appears.

---------- BEGIN SOURCE ----------
class TestAModalDialog extends javax.swing.JDialog
    implements java.awt.event.ActionListener {
    public TestAModalDialog(java.awt.Frame parent) {
        super(parent, true);
        javax.swing.JButton b = new javax.swing.JButton("Dismiss");
        getContentPane().add(b);
        b.addActionListener(this);
        pack();
        setLocation(parent.getLocation());
    }
    public void actionPerformed(java.awt.event.ActionEvent e) {
       setVisible(false);
       dispose();
    }
}

class TestA extends javax.swing.JFrame
    implements java.awt.event.ActionListener {
    public TestA() {
        javax.swing.JButton b = new javax.swing.JButton("Press Me");
        getContentPane().add(b);
        b.addActionListener(this);
        pack();
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                System.exit(0);
            }
        });
        setLocation(new java.awt.Point(x,y));
        x+=100; y+=50;
    }
    public void actionPerformed(java.awt.event.ActionEvent e) {
        new TestAModalDialog(this).setVisible(true);
    }
    static int x = 0;
    static int y = 0;
    public static void main(String[] argv) {
       // put up three JFrames
       new TestA().setVisible(true);
       new TestA().setVisible(true);
       new TestA().setVisible(true);
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
switch to the motif toolkit by setting -Dawt.toolkit=sun.awt.motif.MToolkit when running java 1.6.0 on sparc solaris.