You can set the Generator to use more threads, but there is no a huge increase of the performance form that. The problem is that every parallel computation comes with an overhead. You have to test the program on your machine with different settings, but most probably you will find that the best performance is when you use 3-5 threads.
You may find the Generator faster if you run several copies of FSB Pro and use 2 cores for each copy.
There is also a positive correlation between the processor speed and the Generator performance. The more GHz the better.
Please see the attached image of FSB Pro working on 16 threads. It loads all cores but the Generator is not faster.