1 Core 1,31 s
2 Core 1,40 s
3 Core 1,38 s
4 Core 1,35 s
5 Core 1,32 s
6 Core 1,20 s
7 Core 1,29 s
8 Core 1,51 s
Max Perfomance 1,64 s
So it seems it doesn't use more than 1 core when running SPP.
I've attached screenshots of performance using different core settings.