I dont have that scene to hand just now unfortunately. But I imagine some of it might have been due to pulling all the assets over the network as it was the render nodes that were taking 5/6 mins before any rendering was kicking in on screen. I think the issue still stands that C4D has to regenerate the whole scene each and every frame it would seem which is very inefficient, especially if its just the camera moving. I dont know the workings behind everything and what power you have to interrogate the scene being exported from C4D, but it would look like cinema has to pull all the textures over a network, generate rendertime generators like mograph, surface spread, forester etc and then export the polygons with all shaders assigned. It feels like it does this from scratch every frame no mater what the render engine.
So is there a way to utilise the work you have done with keeping everything in ram and just scanning for changes in the IPR environment and passing that info over to the corona engine / VFB which can quickly load through the changes from one frame to the next and start rendering much quicker? The VFB can already save out images so we can perhaps dispense of the C4D PV entirely for this process as all its doing is hosting the scene and then saving out each frame which could all be handled by corona in its VFB?