Hi Hervé, I personally have never made good experiences with Maxwell-Displacement, I always found it way too slow,
that's why I wondered... Typically adding displacement decreases render speed to about 1/4 or even less, at least on my machine.
Looking at your example-image and taking a 3DCoat-Maxwell-Workflow given I personally would opt to export a far denser mesh
which already looks pretty much like the image on the right and would do the rest with a Normal Map.



- By Jochen Haug