nDisplay Distributed Render Gains

I am relatively inexperienced with nDisplay, I was curious if distributing playback to a cluster of nodes provides performance gains for a complex scene?

For example, one 4k, 16:9 display, split across 4 nodes symmetrically. My thought is that since each machine is only responsible for 1/4 of the final viewport, performance will increase? Or is this idea fallacious since each node in the cluster needs to be aware of the entire scene even if it is not rendering it.

If performance can be improved this way, is there a limit to scalability? For example could one 4k viewport be split into 20 for higher gains?