beavisrp

I had the exact same problem and believe it or not, it turned out to be the July 1 leap second issue described here:
http://artipc10.vub.ac.be/wordpress/2012/07/01/leap-second-causing-ksoftirqd-and-java-to-use-lots-of-cpu-time/

I didn't figure it out until I was using Eclipse to build a plug-in and it was dog slow too. A bit of googling pointed me in the right direction. Hope that helps you!

Dan