I have started using the projection function and it is awesome what it allows
me to do.  My one question is there any tips / tricks to get it to run
faster?  With the models I am rendering it takes about 10 - 15 minutes for
the projection function to complete and the regular 3D version takes seconds
to render.  If not no big deal, I can live with it because of the
awesomeness of it.

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No it is expensive.
You could try exporting your design as a STL (etc), then projecting the
imported STL.
But that doesn't help with dynamic development.
As always, reduce the $fn etc until you need a final result.

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