tunesy, I was about 99% sure you were going to find that out. I'm glad you did it anyway, and so precisely. The number of keys does not matter, it is the load of geometry the slider is pulling around, I am pretty sure. I will be headed into my next Carrara session during this afternoon, and first must find out why I can't load with Native. Then, I can do apples/apples load tests Transposer vs Native with the same scene and see if effects the slider responsiveness. After that, I am going to be in pursuit of various lighting/shading/rendering options including those suggested above, going for realism on my baseline pz3 in less than 80 seconds. Meanwhile, I still have one floating question..... We all know that my chief problem is that I insist on dynamic hair. Several people have cited, in particular, poser-imported hair as the problem, and some have suggested growing hair in Carrara with Anything Grows. But is it POSER strand hair specifically? Is there something intrinsically burdensome with Poser hair? Or is it simply, and understandably, dynamic/strand hair in general that impacts render time, especially under raytrace? If so, if I grew hair in Carrara back to the density and quality of the imported Poser hair, it's likely it would have equal impact on rendertime. Thank you for continued interest in this thread. My turn to dig in and contribute more, now. ::::: Opera :::::