Hi Datsnl,
I checked your file Case 6 and just ran it trough with Pardiso and this is the result i got : (43s)
After that i recalculated it with spooles and the result took some time.
So to speed up the process i would recommend that you get the Pardiso Solver from Ihors Website:
When you scroll down you will find :
After you downloaded it, copy ALL the data to your prepomax/Solver installation path, spooles should already be in there.
Now in prepomax all you have to change is the default solver to the ccx_MKL File: