What runs quicker under jdk1.5?

Hello,
I think I understood on sun's jdk1.5 pages that the startup times for swing applications is now reduced.
But anyone know if the general speed of Java operations is now quicker, for example will the JMF run any faster in 1.5 rather than 1.4.2?
Thanks

And if a JMf application involved procesing data
structures, and int arrays. I thought these might be
now quicker to loop through an array then in 1.4.2.I doubt anything significant changed there. The optimizations in 1.5.0 dealt mostly with reducing the JVM start-up time and memory footprint size.

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