Subject: From: Date:

looking for some Java expertise (large menu frames taking a *long* time to display) Mark Gilmore Wed, 21 Feb 2007 10:50:32 -0500

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hi everyone,
i have recently noticed that *all* JAVA menu frames that contain a 
lot of elements (over 200 or so)
can take a REALLY long time to display.
specifically, it is the Frame.setVisible(true) call that is the culprit.
the delay is proportional *only* to the number of elements in the frame.
it happens with both normal Frames and JFrames.
it happens in both Applets and stand-alone pgms.

this can be seen in 3 places:
         1) click the value of an Integer Object
                 FireFox:
                         The *initial* display can take as long as *30 seconds*
                                 During this time, 
\WINDOWS\system32\rundll32.exe is pegging the CPU AT 98+%
                                 What this DLL has to do with a JAVA 
menu is beyond me (GatesWare).
                         Thereafter, it takes 2-3 seconds
                 I.E.:
                         There is no long delay on 1st display (as 
with FireFox)
                         It takes 2-3 seconds every time (acceptable, 
but see #2).

         2) if you have a lot of objects (i have 390), click the ADD 
button in an ECS Page:
                 FireFox: It takes 10+ seconds to display the Object 
menu every time
                         (rundll32.exe does not seem to come into 
play for this one)
                 IE: same as FireFox

         3) compile/run the JAVA pgm below.
             This is a minimal pgm that reproduces the problem.
             It takes 14 seconds to display a frame containing 500 labels.

any theories or suggestions would be greatly appreciated !
i would also like to know who is (or is not ?) having similar problems.

thanks,
Mark Gilmore
http://OmnipotenceSoftware.com
423-745-0026


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TEST PGM:
import java.lang.*;
import java.awt.*;
import java.awt.Component;
import java.awt.Label;
import javax.swing.JFrame;
public class X
         {
         public static void main(String[] arg)
                 {
                 X1 x1 = new X1();
                 x1.main(arg);
                 }
         }
class X1
         {
         public void main(String[] arg)
         {
         JFrame jframe = new JFrame("MenuLookDemo");
         jframe.getContentPane().setLayout(new 
FlowLayout(FlowLayout.CENTER, 2, 2));
         int x;
         System.out.println("Create frame");
         Label lb[] = new Label[500];            // create frame with 
500 labels
         for (x = 0; x < 500; x++)
                 {
                 lb[x] = new Label(Integer.toString(x));
                 jframe.getContentPane().add(lb[x]);
                 }
         jframe.setSize(800, 400);
         System.out.println("Display frame");
         jframe.setVisible(true);                // display it (takes FOREVER)
         System.out.println("Wait 5 seconds");
         try {Thread.sleep(5000);}
         catch (InterruptedException e0) {};
         System.exit(0);
         }
}

Mark Gilmore
http://OmnipotenceSoftware.com

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