Quote Originally Posted by Nemo5990 View Post
They wouldn't have to rebuild any textures it's an option on the Camera I'm telling you this because I'm a 3d modeler an understand it myself.
Edge detection is done through shaders but that doesn't give you a Cell shaded look if you're using photo-realistic textures.

It also doesn't reduce the amount that is drawn, it will have not positive impact on performance at all.