Benchmark: timing 100 iterations of curl, lwp, lwp-parallel...
      curl: 26 wallclock secs ( 1.04 usr +  0.15 sys =  1.19 CPU) @ 84.03/s (n=100)
       lwp: 30 wallclock secs ( 6.86 usr +  0.51 sys =  7.37 CPU) @ 13.57/s (n=100)
lwp-parallel: 34 wallclock secs (11.07 usr +  0.53 sys = 11.60 CPU) @  8.62/s (n=100)