Pi3 supercomputing
The following runs were generated by the author's 16-node, 64 core, 76.8 GHz. Raspberry Pi3 supercomputer. The runs clearly show the advantage of higher core processing speed, and greater node count. The following two images depict the author's beloved Pi3 supercomputer:

Author's 16-node, 64 cores, 76.8 GHz Raspberry Pi3 Supercomputer:

Close-up of the 16-node Raspberry Pi3 Supercomputer
Let's now have a look at the super cluster execution command syntax, and run results:
alpha@Mst0:/beta/gamma $ time mpiexec -H Mst0 MPI_08_b
#######################################################
Master node name: Mst0
Enter the number of intervals:
300000
*** Number of processes: 1
Calculated pi = 3.141592653590713268840772798285
M_PI = 3.141592653589793115997963468544
Relative Error = 0.000000000000920152842809329741
real 39m34.726s
user 39m25.120s
sys...