FULL PRODUCT VERSION :
java: 1.7.0_11

ADDITIONAL OS VERSION INFORMATION :
Mac OS X 10.8.2

EXTRA RELEVANT SYSTEM CONFIGURATION :
application was started with JavaWebstart

A DESCRIPTION OF THE PROBLEM :
Our fat swing application " ClassWizard " behaves unprofessional slow. While dragging elements there is not a smooth liquid moving but a slow moving with jumping and flickering elements. The reason of this is the fact, that the double buffered painting of offscreen image is 8 times slower then in java 6.

REGRESSION. Last worked in version 6u31

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
I have added a small application to reproduce the bug. Start the application under java 7 and java 6 and wait 1 minute until the drawing of a rectangle at 2 different positions at an interval of 25 milliseconds has stopped. Then close the application by the red window button. A Log file " RuntimeTest " is written to the users home directory. It contains the time sampled for the paint and paintComponent methods of the JPanel. The time sampled for the paint method is 8 times higher then under java 6.

log file under java 6:

Mac OS X 10.6.8 java: 1.6.0_37
count1: 2000 mess1: 937 time spend in paint
count2: 2000 mess2: 430 time spend in paintComponent

logfile under java 7


Mac OS X 10.8.2 java: 1.7.0_11
count1: 1995 mess1: 7774 time spend in paint
count2: 1995 mess2: 473 time spend in paintComponent

7774 millisec is 8 times higher then 937 millisec



EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
double buffered paint Method in java 7 is as fast as in java 6

ACTUAL -
double buffered paint Method in java 7 is 8 times slower then in java 6.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package com.classwizard.cw;


import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

import javax.swing.JComponent;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.WindowConstants;


public class ClassWizard extends Object{
    public static void main(String args[]) throws Exception{
        try{
            RuntimeTestFrame ket = new RuntimeTestFrame();
            GJApp.launch(ket, " RuntimeTest " ,0,0,700,700,null);
        }catch (Exception e){
            System.out.println(e.getMessage());
            e.printStackTrace();
        }
    }
}
class GJApp extends WindowAdapter{
    public static void launch(final RuntimeTestFrame f, String title,final int x, final int y,final int w, int h,String propertiesFilename){
        f.setTitle(title);
        f.setBounds(x,y,w,h);
        f.setVisible(true);
        f.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
        f.addWindowListener(new WindowAdapter(){
            public void windowClosed(WindowEvent e){
                f.closefile();
                System.exit(0);
            }
        });
    }
}

class RuntimeTestFrame extends JFrame{
    protected JDesktopPane desktopPane = new JDesktopPane();
    protected Page worksheet = null;
    PrintWriter writer = null;
    protected File outfile = null;
    boolean _even = true;
    int _flickercount = 0;
    javax.swing.Timer _timer = null;
    public RuntimeTestFrame() throws Exception{
        String user_home = System.getProperty( " user.home " );
        String filepath = user_home + " /RuntimeTest.txt " ;
        outfile = new File(filepath);
        writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outfile), " UTF-8 " )));
        JComponent contentPane = (JComponent)getContentPane();
        contentPane.setDoubleBuffered(true);
        worksheet = new Page( " Worksheet " ,true,false,true,true,writer,this);
        desktopPane.add(worksheet);
        contentPane.add(desktopPane,BorderLayout.CENTER);
        worksheet.setPreferredSize(new Dimension(500, 500));
        Rectangle bounds2 = new Rectangle(0, 0, 500, 500);
        worksheet.setBounds(bounds2);
        String osname = System.getProperty( " os.name " );
        String osversion = System.getProperty( " os.version " );
        String java_version = System.getProperty( " java.version " );
        writer.print(osname + " " + osversion + " java: " + java_version + "
 " );
        worksheet.setVisible(true);
        desktopPane.revalidate();
        
        // move the carea 1000 times for and back and sample time spend
        _timer = new javax.swing.Timer(25, new ActionListener(){
            public void actionPerformed(ActionEvent evt){
                try{
                    if(_even == true){
                        worksheet.repaint();
                        _even = false;
                    }
                    else{
                        worksheet.repaint();
                        _even = true;
                    }
                    _flickercount++;
                    if(_flickercount == 2000){
                        _timer.stop();
                        writer.print( " count1: " + worksheet.count1 + " mess1: " + worksheet.mess1 + " time spend in paint " + "
 " );
                        writer.print( " count2: " + worksheet.count2 + " mess2: " + worksheet.mess2 + " time spend in paintComponent " + "
 " );
                    }
                }
                catch (Exception ex){
                    System.out.println(ex.getMessage());
                    ex.printStackTrace();
                }
            }
        });

        _timer.start();
        

    }
    public void closefile(){
        writer.flush();
        writer.close();
    }
}

class Page extends JInternalFrame
{
    long mess1 = 0;
    long mess2 = 0;

    int count1 = 0;
    int count2 = 0;

    protected RuntimeTestFrame _owner = null;
    protected PrintWriter _writer = null;
    protected Canvas canvas = null; // drawarea of page
    protected JScrollPane _sp = null;
    public Page(String title,boolean resizable, boolean closable, boolean maximizable, boolean iconifiable,PrintWriter writer,RuntimeTestFrame owner) throws Exception{
        super(title,resizable,closable,maximizable,iconifiable);
        _writer = writer;
        _owner = owner;
        JComponent contentPane = (JComponent)this.getContentPane();
        canvas = new Canvas(writer,this);
        _sp = new JScrollPane(canvas);
        contentPane.add(_sp,BorderLayout.CENTER);
        canvas.setBackground(Color.WHITE);
        canvas.setSize(new Dimension(500,500));
    }
    public void displayRectangle(Graphics g){
        Color boxcolor = new Color(0, 250, 0);
        g.setColor(boxcolor);
        if(_owner._even == true){
            Rectangle r1 = new Rectangle(100, 100, 100, 100);
            g.fillRect(r1.x, r1.y, r1.width, r1.height);
        }else{
            Rectangle r1 = new Rectangle(300, 300, 100, 100);
             g.fillRect(r1.x, r1.y, r1.width, r1.height);
        }
    }
}
class Canvas extends JPanel{
    PrintWriter _writer = null;
    Page _page = null;
    Image offscreen = null;
    
    public Canvas(PrintWriter writer, Page page) throws Exception{
        super();
        _writer = writer;
        _page = page;
    }
    @Override
    public void paint(Graphics g){
        long tmess1 = System.currentTimeMillis();
        try{
                Rectangle r222 = g.getClipBounds();
                if(offscreen == null){
                    int width = getSize().width;
                    int height = getSize().height;
                    offscreen = createImage(width, height);
                }
                Graphics og = offscreen.getGraphics();
                og.setClip(r222.x, r222.y, r222.width, r222.height);
                super.paint(og); // all drawing into offsreenbuffer
                Rectangle clip = g.getClipBounds();
                // copy offsreenbuffer to screen in changed rectangle
                g.drawImage(offscreen, clip.x, clip.y,clip.x+clip.width,clip.y+clip.height,clip.x, clip.y,clip.x+clip.width,clip.y+clip.height, null);
                og.dispose();
        }catch (Exception ex){
            System.out.println(ex.getMessage());
            ex.printStackTrace();
        }
        tmess1 = System.currentTimeMillis() - tmess1;
        _page.mess1 += tmess1;
        _page.count1++;
    }
    @Override
    public void paintComponent(Graphics g){
        long tmess2 = System.currentTimeMillis();
        try{
            super.paintComponent(g);
            _page.displayRectangle(g);
        }catch (Exception e){
            System.out.println(e.getMessage());
            e.printStackTrace();
        }
        tmess2 = System.currentTimeMillis() - tmess2;
        _page.mess2 += tmess2;
        _page.count2++;
    }

}

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

SUPPORT :
YES