Paint performance with JScrollPane very slow in jdk 1.4?

Question

I got a simple program that overrides paintComponent on a JPanel. Then draws lots of lines, rectangles and some strings. The panel is then added to a scrollpane.
The scrolling is very smooth in java 1.3.1, but very slow in 1.4.2
the paintComponent takes between 16ms and 30ms with java 1.3.1 but 70-200ms with java 1.4.2.
I tried turning of antialising etc.. but no help. Whats the "improvement" they made in jdk 1.4?

Answer 1

Ok I made a simple example, which draws around 5000 elements.
Sourcecode is here: http://www.mcmadsen.dk/files/ScrollPaneTest.java
I did several testruns on java 1.4.2 and java 1.3.1, heres the "avarage" result:
Java 1.4.2:
     Current: 140ms High: 203ms Avg: 144ms Low: 125ms
Java 1.3.1:
     Current: 62ms High: 219ms Avg: 68ms Low: 47ms
The paintComponent() looks like this:
public void paintComponent(Graphics g)
super.paintComponent(g);
long offset=System.currentTimeMillis();
PaintElement paintElementTmp;
for(int i=0;i<paintElements.size();i++)
paintElementTmp=(PaintElement)paintElements.elementAt(i);
g.setColor(paintElementTmp.getBackground());
g.fillRect(paintElementTmp.getX(),paintElementTmp.getY(),paintElementTmp.getWidth(),paintElementTmp.getHeight());
g.setColor(paintElementTmp.getForeground());
g.drawString(paintElementTmp.getText(),paintElementTmp.getX(),paintElementTmp.getY());
long done=System.currentTimeMillis();
long current=done-offset;
sum+=current;
if(current>high)high=current;
if(low>current)low=current;
count++;
System.out.println("Current: "+current+"ms High: "+high+"ms Avg: "+(sum/count)+"ms Low: "+low+"ms");
I tried all the renderinghints, but no difference (from the default settings). Also the scrolling is very slow and stops all the time in java 1.4.
Any ideas on how to get java 1.4 to perform as java 1.3.1?
Thanks