You are currently using Unfold3D generation 9 from Polygonal Design. Rizom-Lab does not propose support for that software in that version. Please contact Polygonal Design directly to ask for Unfold3D generation 9 support.
So, to test once again I did get a 2017.0.17 version, loaded same obj from Zbrush (about 200 mb) and... I get 1 FPS. Which is sad, because I thought I could recommend this software to our Art director. Any ideas on on low FPS?
The problem comes from the model size, which is rather big: more than 3 million triangles. Unfold3D currently doesn't use video card optimisation at its top. Which implies that problem. Which means that if you are going to use such sized models with Unfold3D, you may have to avoid to drink coffee
Be sure it improving the viewports is in our medium terms todo list.