CUDA is Fast!

So far, the new CUDA tracer is ~60-70% faster than the old one!  That makes me very happy.  I've almost hit my goal of 10 fps on the medium-quality ship scene.  Now, however, I'm equipped with much better profiling tools (thanks, NVIDIA!!!), and a generally-better idea of how to proceed with optimization.  As always, I'm hopeful :)

Here are two familiar shots, this time rendered with CUDA...less noise in the same amount of time!