Lag Solved!

As it turns out, the only reason I was having so many issues with lag in my Kinect program was my choice of computer. I was running simpleopenni and processing on an Acer netbook with one gig of RAM which, as it turns out, is not really enough to support a Processing program of any great complexity. When I downloaded and configured simpleopenni for my family's brand new iMac (8 gigs of RAM), the lag disappeared completely. So, problem solved! Although it's significantly more difficult to position a 21" iMac next to a ping pong table than it is a 10.1" netbook....