Running "case9.inp" (uniform mesh, 400K particles, initial Bessel profiles)
for 1000 time steps on a Cray T3E MPP supercomputer:

#CPUs   Run-time (s)  Gain
1        542.2          1.00
2        264.4          2.05
4        133.8          4.05
8         74.8          7.25
16        35.6         15.2