Maximised window goes slow

[Malcolm Storey]

Have just noticed that when I maximise the window, it all goes slow as though there's a processor-hungry background process. javascript:%20x() It's not my code cos the following modified simple example from the Sun website shows the problem (sorry about Sun's lengthy disclaimer but thought I'd better leave it in!)

Am running Windows XP-Pro v2002 SP3 on a Pentium 4, 1.70GHz 1.69GHz 1.25GB RAM. I'd be grateful for advice (or somebody telling me my PC's flakey!)

Many thanks
Malcolm Storey

 
/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
import java.awt.BorderLayout;
 
import javax.swing.JFrame;
import javax.swing.JTextArea;
 
/* FrameDemo.java requires no other files. */
public class FrameDemo {
    /**
     * Create the GUI and show it. For thread safety, this method should be
     * invoked from the event-dispatching thread.
     */
    private static void createAndShowGUI() {
        // Create and set up the window.
        JFrame frame = new JFrame("MaximiseSpeedBugDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JTextArea texArea = new JTextArea(
                "Maximise the window then drag the mouse over this text to select it .Why does the cursor lag behind the mouse when it doesn't do so when the frame isn't maximised?");
        frame.add(texArea, BorderLayout.CENTER);
 
        // Display the window.
        frame.pack();
        frame.setVisible(true);
    }
 
    public static void main(String[] args) {
        // Schedule a job for the event-dispatching thread:
        // creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

[Edit] Added code tags. RP [/Edit]
[ November 09, 2008: Message edited by: Rob Prime ]

[Rob Spoor]

Please Use Code Tags. I've added them for you this time.

I've tried it but found no slowness at all. Can you open your Windows task manager, then do your stuff while the task manager is still visible (it's always on top so that's a plus), and check the CPU usage of your program?

[Malcolm Storey]

Task Manager shows Javaw.exe using a lot of processor time (20-30, rising to 90 when I drag slowly). It uses a lot less (10-15) when not maximised.

Have checked Java control panel and it says I have the latest version. Have just updated Eclipse. No improvement.

Am not sure about the libraries tho. (Am new to Java)
Thanks
Malcolm

[Rob Spoor]

That's odd that your CPU usage goes up like that.

Sure it's "only" a P4, but I've just tested it on a P4 3GHz with just 1GB of RAM, and even with hardware acceleration turned off for the graphics adapter it didn't go over 6%.

[Malcolm Storey]

Thanks Rob. Seems it's just my flakey old PC - a problem that will get fixed sooner or later by buying a new one.

Thanks again, and apologies for missing out the code tags.
[ November 11, 2008: Message edited by: Malcolm Storey ]