A very slow remove() & add() operation

Question

The method below switches two JPanels in and out of a JFrame.
Both JPanels and their contents have been instantiated before the method is called.
However, the switch takes 16 seconds! (The first time the method is called. Thereafter, if executes
normally)
I have coded other, similar methods which make the switch essentially instantaneously.
Can anyone tell me the sorts of factors that would result in such a delay, so that I can avoid
them in my code?
void switcherMethod() {
     aClass.aJFrame.setSize( 612, 662 );     //     --------------- ? size     
     aClass.aJFrame.getContentPane().remove( anotherClass.jPanelOne );
     aClass.aJFrame.getContentPane().add( aClass.jPanelTwo );
     aClass.aJFrame.invalidate();
     aClass.aJFrame.validate();
     aClass.aJFrame.repaint();
}Many thanks in advance.

Answer 1

I am also seeing a similar problem with the 1.4.1 JVM.
I remove a component from a panel, and add a different one, and it takes 7-10 seconds for the add() to return. All other functions (remove, validate, etc) are fast, just the add() is slow.
Anyone have any insight???