~/NetBeansProjects/jruby $ time jruby -O ~/tmp/ruby1.9/benchmark/bm_so_array.rb   

real    0m25.098s
user    0m24.335s
sys     0m0.455s


~/NetBeansProjects/jruby $ time jruby -O ~/tmp/ruby1.9/benchmark/bm_so_array.rb 

real    0m19.812s
user    0m18.988s
sys     0m0.426s


~/NetBeansProjects/jruby $ time ruby ~/tmp/ruby1.9/benchmark/bm_so_array.rb 

real    0m7.435s
user    0m7.305s
sys     0m0.027s