Has this been addressed yet?
I was testing Octane out on two systems, and was immediately put off by how bad C4D lagged with the live viewer running. Even a new scene with a cube in it is choppy. I tried changing priorities and enabled cards, no change. Standalone runs fine.
One system is an iMac with 1080ti eGPU, the other a 5,1 tower with 3x 1080ti.