SHoutzager There are a couple of reasons which may cause slow renders. First of all hardware obviously, second render settings, third amount of objects and their handling. The first two are beyond my scope as those relate to the overall rendering topic, while the third I can explain. So, first of all, you should use proxies when you have large amounts of the same objects (if you use RN library presets refer to this), second you may be interested in limiting the number of scattered objects using Field of View options (Limit will cull all elements not seen by the picked camera and if your camera is low you may use Density Falloff as the further objects are the fewer objects you need to get full coverage for eg. for grass - fewer meshes to render equals quicker light bouncing solving), third V-Ray integration suffers from an issue with the long cleanup after rendering (especially when you enter millions of objects) and we just have to wait for V-Ray update on that matter.
SHoutzager If you have time it would be great to have some video tutorials
If I would, I would do it already believe me 😣 As soon as this will be possible I will jump to work on the promised webinar. Apart from that, soon Dusan from HowToRhino should have something interesting on his YT channel.
