finally, I got some time to play with octane in Houdini. I am impressed with the interactivity of the renderer. The render time was about 2:30 Minutes on RTX5000 for the image (in 5k resolution).
‘ve open a Houdini and rendered with RenderMan 22.6. I used only xrDirectLighting integrator and the render speed was super fast on CPU. I’ve ditched the Pathertracer for this scene, it gave no visual benefits/improvement in this case. Pure spline rendering, no Polygon meshes.