Essential graphics still taking render time to process internal layers which are invisible

So I have a composition that's rather complex with say 30 layers and a 3D camera which I'll call "Main Comp".  I want to be able to render certain layers as separate alpha .mov files to be re-composed later for color correction etc. (for example layers 1-3 4-6 and 7-12 as different files). I know I could precompose those layers remembering to duplicate the camera so those precomps each have the camera to make the 3D layers work.  

I thought I could improve this workflow by actually nesting my "main comp" inside a number of other "export" comps and in each one using essential graphics on each copy of the "main comp" to disable the layers inside of it with opacity sliders leaving only the layers I want to export at %100.  This method is more ideal because I have speparate comps for exporting but still just one main comp where I can tune all the layers together if adjustments are needed.

The problem here is that when I went to render, each export comp which should only have to process the few layers enabled within their copy of the "main comp" took equally long as if they were processing all the layers in the "main comp".  I wonder if it's possible for Adobe to fix this so that essential graphics switches actually turn off the processing power required to process those internal layers when their opacity is %0.