gistfile1.rb

require 'benchmark'
include Benchmark

var = (1..100).to_a

bm do |x|
  x.report { 1000000.times { var[1, var.length] } }
  x.report { 1000000.times { var[1..-1] } }
end

__END__
    user     system      total        real
0.330000   0.000000   0.330000 (  0.329509)
0.310000   0.000000   0.310000 (  0.310516)