@Razor42 - thank you for that tip. I did that.

Everyone: I tried to use the exact same render preset I saved out, on a different test scene -- and it failed to work as intended. I conclude that each scene requires its own render preset. I will therefore not provide a specific render preset because it may lead to misunderstanding of its purpose. My video is nothing more than a guide to show which settings to tweak in order to get a fast render inside Daz Studio4.10 using iRay. I apologise if this is a less than satisfactory decision for some users. Thanks for watching.

Eternal Hobbyist