I usually use luxrender, but I stumbled upon embree today. Man is it fast! And not even GPU accelerated! Anyways, I was wondering if embree is actively developed by the community and if someone would be up to the task of creating a subsurface scattering material. It's definately a tall task, but it would be a very good addition to this renderer.
For more complete information about compiler optimizations, see our Optimization Notice.