$ ruby arbre_benchmark.rb
Rehearsal ------------------------------------
6.358706 0.182712 6.541418 ( 6.555321)
--------------------------- total: 6.541418sec
user system total real
5.747130 0.016499 5.763629 ( 5.776037)
$ APPLY_PATCH=yes ruby arbre_benchmark.rb
Rehearsal ------------------------------------
5.964307 0.156302 6.120609 ( 6.127731)
--------------------------- total: 6.120609sec
user system total real
5.192958 0.003310 5.196268 ( 5.202189)
5.192958/5.747130 = 10%