How do I know what takes the most resources when rendering a .blend file?
There isn’t a easy way to find yet… Maybe some addons can do that.
First, there is memory usage, and then computer power.
For memory in general it’s the textures that takes the most space.
You can compare the peak memory usage with your textures, and what you get when enabling that :
Or even better if all your textures are in the same folder you just rename that folder temporarily.
Then the remains is mostly geometry : how many polygons can fit into memory.
And from there what I generally do, is to disable some groups of objects one by one, to see how they impact the render.
I know those thingies, but Thanks for your mentions(especially addons).
If you are really interested in the subject and willing to put the efforts, it’s possible to calculate how much an image take memory, and it’s also possible to compute how much geometry takes space by calculating polys, UVs, vertex groups… and stuff like that…
Maybe it’s even possible to have an AI do some automation and build an addon that breakdown your scene…
Since it’s not that difficult and it’s likely to be helpful it’s worth checking if someone already did that…
If not , you can probably get a few bucks by selling that ! Or be super nice and provide that on blender extensions !