Check out JavaFX Asteroids (using a thin Greenfoot emulation library in 
SnapCode):

        JavaFX Asteroids with Greenfoot and SnapCode
        
http://reportmill.wordpress.com/2014/04/21/javafx-asteroids-with-greenfoot-and-snapcode/

I haven't done any performance work yet, but it runs well with a screen full of 
asteroids on a MacBook Pro.

jeff

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