Quote - If you have any dynamic hair in the scene and want raytrace shadows, you are facing gigantic rendertime hits unless you turn off "visible to raytrace" for the hair. But if you turn off raytrace on hair your hair will not be casting shadows. What to do, what to do. Either live without shadows from hair or throw in a depth mapped light just to cast shadows from hair. Or...accept the hit.

This is another great flaw of Poser, that you cannot set a light to only affect a selection of objects in a scene, or to ignore certain objects.  What I'd suggest for dynamic hair (and how it's done in other apps e.g. Cinema) is to have one or more specific light(s) affect hair, and other practical lights ignore it.  In Poser, all lights have a global effect for the entire scene, unless there is some trickery that can be done with materials to link a given surface with a particular light (I don't think there is).

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