My Mom likes to play the Pogo.com Java games. In OS 9, this is fine, because Java runs at a usable speed. However, on her iBook 500 in Mac OS X, Java games at pogo.com play at an unusable speed.
Well, I really wanted to upgrade her iBook to OS X to take advantage of the new features in Jaguar, so I needed a solution. I found that running Internet Explorer in Classic mode runs at the same speed as it does in OS 9, Java and all. So, if you miss playing your Java games in OS X due to them being very slow, simply start up Classic IE and play at the same old OS 9 speed!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020903060311352