Decorator strategies battletested. Original script: https://gist.github.com/rbishop/7555357

decorators.rb

#ENV:  Ruby 2.4.1, a  i7-6700HQ CPU, 16GB RAM

require 'benchmark'
require 'delegate'
require 'forwardable'

class Person
  def initialize(name)
    @name = name
  end

  def name
    @name
  end
end

class PersonDelegator < SimpleDelegator
  def initialize(person)
    super(person)
  end
end

class PersonForwarder
  extend Forwardable

  def_delegator :@person, :name

  def initialize(person)
    @person = person
  end
end

class PersonMissing
  def method_missing(method_name)
    if @person.respond_to?(method_name)
      @person.send(method_name)
    else
      super
    end
  end

  def initialize(person)
    @person = person
  end
end

class SubPerson < Person
end

bob = Person.new('Bob')
decorated_bob = PersonDelegator.new(bob)
forwarded_bob = PersonForwarder.new(bob)
missing_bob = PersonMissing.new(bob)
sub_person = SubPerson.new(bob)

Benchmark.bmbm do |bm|
  bm.report('Sending message directly') do
    1_000_000.times do
      bob.name
    end
  end

  bm.report 'Sending message through SimpleDelegator' do
    1_000_000.times do
      decorated_bob.name
    end
  end

  bm.report 'Forwarding message using Forwardable' do
    1_000_000.times do
      forwarded_bob.name
    end
  end

  bm.report 'Sending message using method_missing' do
    1_000_000.times do
      missing_bob.name
    end
  end

  bm.report 'Sending message using subclassing' do
    1_000_000.times do
      sub_person.name
    end
  end
end

#Rehearsal ---------------------------------------------------------------------------
#Sending message directly                  0.050000   0.000000   0.050000 (  0.055301)
#Sending message through SimpleDelegator   0.280000   0.000000   0.280000 (  0.280395)
#Forwarding message using Forwardable      0.150000   0.000000   0.150000 (  0.150432)
#Sending message using method_missing      0.160000   0.000000   0.160000 (  0.157218)
#Sending message using subclassing         0.050000   0.000000   0.050000 (  0.052206)
#------------------------------------------------------------------ total: 0.690000sec
#
#                                              user     system      total        real
#Sending message directly                  0.050000   0.000000   0.050000 (  0.050754)
#Sending message through SimpleDelegator   0.280000   0.000000   0.280000 (  0.279871)
#Forwarding message using Forwardable      0.160000   0.000000   0.160000 (  0.152889)
#Sending message using method_missing      0.150000   0.000000   0.150000 (  0.152737)
#Sending message using subclassing         0.050000   0.000000   0.050000 (  0.051002)