Slow to add components to a displayed container.

I am working on a Java project which needs to remove components from a Panel (pp_right) and then add componts to the same Panel (pp_right). My program was working well before under environment JRE 1.2 however it is very slow now to add componets to the Panel under the lastest Java environment (JRE 1.3 or 1.4).
I would really appreciate if somebody can help me out. Here is the website if you are interested in trying it:
http://cee.uiuc.edu/sstl/java/mdof/Isolation.html. Just click the button "Show Virtual Model". The codes related to add/remove componts are:
else if (evt.target == virtualModelButton)
if (virtualModelButton.getLabel() == "Show Virtual Model")
getstorynumber(); // get storynumber, if it has been changed, reset parameters.
virtualModelButton.setLabel("Show Control Panel");
pp_right_bottom.remove(pp_button1);
pp_right.remove(pp_right_top);
pp_right.add("North", pp_right_top2);
else if (virtualModelButton.getLabel() == "Show Control Panel")
pp_right.remove(pp_right_top2);
virtualModelButton.setLabel("Show Virtual Model");
pp_right_bottom.add(pp_button1, 0);
pp_right.add("North", pp_right_top);
pp_right.validate(); // This method has to be called each time after
// the components are added/removed.
Thank you very much!

Some tips when adding / removing components from a Container object:
1. It is often easier and safer to use the removeAll() method, and then rebuild the panel as desired. It is possible to get into trouble if the same component is added to different components or added to the same container multiple times.
2. After you have rebuilt your GUI, call the revalidate() method, followed by a repaint().

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