Something for FEM workbench?
Yes, when Calculix get this functionality it will be "automatically" available in FC
In my opinion this is difficult subject. I see that commercial CAD packages have problems with utilizing all CPU cores. They use multithreading "only" for Rendering, FEA/CFD and only few other tasks. From 3-4 years SW and, as far as I remember, Inventor use many cores for preparing 2D documentation.
In FC is one more problem, the solution for multithreading and/or using GPU must be cross-platform.