Box elements??? Did you import choosing to allow re-posing inside Vue? I don't know what "box elements" are.

The same advice given above would apply to the face & hair as well.  In addition when rendering for the hair make sure you have AA turned way up(this will increase render times) OTOH this can vary between different hairs. I would also suggest turning highlights completely off for hair & let Vues Atmos. do it's thing - natural highlights.

IMO dynamic hair looks hideous no matter what one does - all the renders I've seen using DYN hair look clumpy & horribly grainy.