What exac

-fake glossy using a dense bumpmap (cloud procedural) to simulate the blurry reflections…“Nobump” actived to avoid cache computing the bump…thanks to _bert for this magical tip

What exactly is the Nobump feature? How do I access it?

Um, yeah, it looks like a messed up the thread title somehow. Ignore that.

No-bump is in yafray. It’s a tool to stop bump maps from casting shadows.

Yeah, no bump comes from Yafray’s GI Panel with Cache enabled, it disables bump mapping in totally indirectly lit parts of the image.
It is useful for preview renders of lower quality.