The test case below runs three to four times slower on JDK 1.3 as compared to
1.1.8. The customer's tests with JProbe show that with JRE 1.3, almost 50% of the time is spent on 3 methods that weren't in 1.1.8: ".Finalizer.", ".Reference Handler." and ".SunToolkit.PostEventQueue-0."

import java.awt.*;

class Tester
{
public static final int IMG_WIDTH = 600;
public static final int IMG_HEIGHT = 600;

public Tester()
{
// we use this to compute the total program lifetime before System.exit()
_programStartTime = getTime();

_frame = new MyFrame();
_frame.setBounds( 100, 100, IMG_WIDTH, IMG_HEIGHT );
_frame.setVisible( true );

testImage();
}

public static void main( String[] args )
{
new Tester();
}

public void testImage()
{
long startTime = getTime();

Image img = _frame.createImage( IMG_WIDTH, IMG_HEIGHT );
Graphics g = img.getGraphics();

draw( g );

System.out.println( "Drawing on memory image: " + elapsedTime( startTime ) + " ms" );

_img = img;
_frame.repaint();
}

protected void draw( Graphics g )
{
// we do some drawing intensive calls
for ( int times = 0; times < 5; times++ )
{
for ( int i = 0; i < IMG_HEIGHT; i++ )
{
g.setColor( new Color( i % 256, 255 - (i % 256), i % 256 ) );
g.drawRect( i, i, 200, 200 );

g.setColor( new Color( i % 256, i % 256, 255 - (i % 256) ) );
g.drawOval( i, IMG_HEIGHT-i, 100, 200 );

g.setColor( new Color( 255 - (i % 256), i % 256, i % 256 ) );
g.drawString( "g.drawString()", 0, IMG_HEIGHT-i );
}

g.drawLine( 0, 0, IMG_WIDTH, IMG_HEIGHT );
g.drawLine( IMG_WIDTH, 0, 0, IMG_HEIGHT );
g.drawLine( IMG_WIDTH / 2, 0, IMG_WIDTH / 2, IMG_HEIGHT );
g.drawLine( 0, IMG_HEIGHT / 2, 0, IMG_HEIGHT / 2 );
}
}

protected long getTime()
{
return System.currentTimeMillis();
}

protected long elapsedTime( long startTime )
{
return getTime() - startTime;
}

class MyFrame extends Frame
{
public void paint( Graphics g )
{
if ( _img != null )
{
long startTime = getTime();

for ( int times = 0; times < 25; times++ )
g.drawImage( _img, 0, 0, null );

System.out.println( "Painting buffered image: " + elapsedTime( startTime ) + " ms" );

System.out.println( "Program lifetime: " + elapsedTime( _programStartTime ) + " ms" );

// we can exit here, no need to keep on living if we already computed how long it takes to paint
System.exit( 0 );
}
}
}

protected Frame _frame;
protected Image _img;

protected long _programStartTime;
}