Are there any benchmarks that illustrate the performance of Xith vs. Java3d?
Yes my demos come in two flavors: Java3D and Xith3D.
Normally my Xith3D demos run twice as fast as Java3D ports 
I viewed your demos on the xith site, launching them with JWS. But I didn’t have a choice between Xith and J3D. How do I get the Java3D flavors?
Lemmie put them on my webspace and I’ll get back to you 
http://www.users.xith.org/JavaCoolDude/Java3D/
Still got tons on my harddrive, but I’m too lazy 
I’m also working on a new demo so… ;D
Edit: You’ll need displayOptions.jar from my lib directory