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This is a Conmen practise for Newbies to have all the AOV passs on render! and wonder wondering "why is this taking so long to render!"
Well there are a few thing we need to consider as to why!
1) the more AOV you add the long it take to render. this can add 1.2-1.8 times to render time! so make sure to pike the right ones.
2) not all AOV passes need light Computation. so it best to put this in a Different render, this will help you save time on rendering and disk space. i like to call the UT pass A good example is PWorld (i don't personally think PWOLD need AA but i leave this to a personal choice) and VrayDirt
3) Reflection Filter is your friend and can help you save a lot of time on re-rendering because A: you screwed up IOR or wanted to break up the reflation and using it to fix nosiey renders
4) allway have the Sampler Rater pass! this pass will tell you where all the samples are going and why its slowing down your render... this pass is your Best friend ( https://vimeo.com/86010717 )
happy lomping!
