i have submitted the Bugreport.
I have also found another solution for smooth scrolling.
I'm using the following function:
private void copyArea(int x,int y, int width, int height,int dx,int dy)
It works great with Images with a resolution about 800x600 (same speed as with copyArea but without slowdowns). With my new cpu(XP1600) i can use the function for even bigger images. I'm not really sure why the speed is cpu dependent,but i didnt benchmark it very good.
I hope it will help you.
Homer J Simpson ( J stands for JAVA )