Unused variable removed - Performance Improved
ruby 2.0.0-p247
Rehearsal ---------------------------------------
old   0.590000   0.020000   0.610000 (  0.615266)
new   0.160000   0.000000   0.160000 (  0.159566)
------------------------------ total: 0.770000sec

         user     system      total        real
old   0.570000   0.020000   0.590000 (  0.584801)
new   0.130000   0.000000   0.130000 (  0.131258)