Eval: 56 wallclock secs (45.19 usr +  0.00 sys = 45.19 CPU) @ 3319.32/s (n=150000)
  While Loop:  5 wallclock secs ( 4.69 usr +  0.00 sys =  4.69 CPU) @ 31982.94/s (n=150000)
Substitution:  1 wallclock secs ( 1.41 usr +  0.00 sys =  1.41 CPU) @ 106382.98/s (n=150000)