Hi! Thanks for this thread, I am also in this moment of not being sure if my render is optimized. Basically I am not great with making very photorealistic renders so far with great details so now that a render with an empty room with a wood floor + windows takes 38 minutes, I am slightly worried about how it would be if I add various materials etc.
I am now trying to get a nice effective workflow for renders because I now feel it takes a bit too much time but of course, it is all relative. I have been rendering 300x300 images to get the light level right + displacement but when I got a proper lighting level, I just changed the resolution to 2000x1700 and all of a sudden the images were much brighter. So I am not sure I can continue like that.
I was trying to understand the settings etc, from what I understand the light cache uses 100 bounces as default while brute force only uses 3 by default, so instead of increasing the performance, according to the vray manual it should actually slow it down.
Anyways, now I am playing with the suggestions above but I am wondering if it is normal that it starts out “memory usage; 1.2 mb” when I have listed 800 mb as my memory limit? In task manager though it seems to use about 30% while the CPU is running at 100%. I also noticed my GPU had been unhinged /physically) while moving so I thought I found the issue of relatively slow renders but when I connected it, changed the cable to the GPU I do not notice a difference. Is there a setting for me to choose between GPU or CPU except for the RT engine?