I am working on a project with a snow / ice surface layer on which I connected the Reflective Shader. The render was still not complete after over 17 hours. I paused it, and started over with the same .tgd, but plugged the Default shader and added Specular highlights, expecting to have no effect on render time. In less than 2 hours, the render was complete. So the results seem to be the same between the two, but render times (and I've seen it before) with Reflective is vastly longer. Is this a known issue? Or does Reflective produce a quality that requires a long render?