Hi all

quick question here:
I'm trying to render using pass contribution maps, But adding a contribution maps will take as much as 3 times as long to batch render a single frame, and I've got 300...
I've googled a lot and tried to find an answer, but I haven't found any.
I'm using maya 2014
I've got referenced geometry and textures in my scene, as well as mental ray lights (physical and infinite)
I really appreciate your help.

Cheers