I'm asking your help in understanding the following situation, or to find a solution to it.
I have realized during my last personal project, that the rendering speed decreased dramatically after adding a tree model to the scene.
I used a Plant Factory tree exported to obj, and rendered with PT kernel in standalone.
Today I made a short test with a quite crowded tree model from Evermotion, and with this Plant Factory tree model.
Here are the details of the models:
Plant Factory model size in vram: 1001 mb (1744424 tri)
Evermotion model size in vram: 1076 mb (2115840 tri)
I set up a simple hdri environment (above written vram usage is calculated with the hdri image loaded).
Rendering time for the PF model was 8:25 minutes, and 28 seconds for the EM one. EM rendered 17 times faster.
Why?
How can I optimize the very nice model of PF to reach the same rendering speed?