I am having big problems when it comes to rendering in Nvidia Iray. My DAZ Studio "Settings" are with maximum Textures and 2x2 Pixel (at maximum). Nvidia Iray settings are untouched.

When I use default HDRI landscapes (like Maui A + cameras) rendering takes approximately 8-10 minutes to render a scene with 2 characters (Genesis 8 males, like Michael 8) who are fully dressed up, with body morphs, hair (head + beard + body hair). Body muscles also. When I render in a camera view (from Maui A) it renders much faster then with Preview camera.

But when I try to render in an interior or exterior with 'live' props (buildings, furniture, roofs, walls etc.) it is either way too dark (so that I can see nothing). It also takes way too long to reach 1% rendering after ~10 minutes. So, it is impossible to wait for many hours just for a picture.

Then I found Iray Ghost Light Kit. With it, it speeds up the usage of lights' memory (before ~3 GB, with this ~1 GB or less). This product also increases render time. But only when I render with HDRI Iray landscapes like Maui A. When I render in an exterior or interior with 'real' props (building, furniture etc.), rendering needs way too long. Even when I use Iterations 80%, Denoisers 33%, and max time 3000.

Rendering with HDRI (like Maui A) is the best way but I do not see in Preview the background and I do not see where the characters (human figures), props (like furniture) are. This is not a solution when I want to use furniture. When I ad furniture (like chair) into the scene it looks in rendered picture un-natural with the STATIC background. For short and quick pictures, the HDRI (static) landscapes (without props, furniture, buildings) are best choice.

And: I render always in UHD (3840x2160 resolution, and in "Photoreal".

I would like to know what are the best settings to get real life renders with 'real' interiors and or exteriors.

I have: Nvidia GeForce 900x series (6 GB), 16 GB DDR3 RAM, Intel i7 series processors (4 cores, 8 threads), an SSD system hard drive. Laptop with 17" monitor in Full HD.