Tx Beanzvision
I think you are right and it might be related to the geo. I experienced these issues in the past with Maxwell render. But so far I did not notice it with CR.
I can't check anything right now since the system is rendering.
Its a bit strange though that there is such a huge difference with cubic en uv projection. Anyhow, maybe a good time to study uv mapping in C4D a bit more.
I am working with a new Mac Studio Ultra 128gB since yesterday. At first I was not all that impressed being preoccupied with the displacement maps. But later this afternoon I had a fantastic time. Interactive rendering worked so fluent and everything so incredibly fast. A detailed high-rise model and most of the time instant feedback in the interactive viewport.
Its a pity the C4D asset browser does not work at all. However I try to set up a database once its gets to any considerable size it never shows in the asset browser, a complete waist of time.
Now rendering and previewing is fast, getting to my libraries with Maxtree, Graswald and Bentanji assets is a bottleneck. The new C4D asset browser would have been a great solution but C4D totally misunderstood how to do that. The chaos cosmos browser is a lot better. Wish the complete Maxtree libraries where there. Would be nice if you could add local libraries to the Cosmos library.
No matter the render engine , its all about assets.