Performance comparison of several roughly equivalent representations of # data objects. Compares Struct, OpenStruct, Hashie (Dash and Mash), and # ActiveModel.

results

                           user     system      total        real
OpenStruct slow        1.710000   0.020000   1.730000 (  1.794663)
OpenStruct fast        1.660000   0.020000   1.680000 (  1.724525)
Struct slow            0.050000   0.000000   0.050000 (  0.045123)
Struct fast            0.030000   0.000000   0.030000 (  0.035193)
Hashie Dash            0.370000   0.000000   0.370000 (  0.370817)
Hashie Mash            0.410000   0.000000   0.410000 (  0.435168)
ActiveModel            0.220000   0.000000   0.220000 (  0.228006)

struct_openstruct_hashie_am.rb

#!/usr/bin/env ruby
# encoding: utf-8

# Performance comparison of several roughly equivalent representations of
# data objects. Compares Struct, OpenStruct, Hashie (Dash and Mash), and
# ActiveModel.
#
# Based on:
# http://stackoverflow.com/a/4459132

require 'benchmark'
require 'ostruct'
require 'hashie'
require 'active_model'

REP = 100000

User = Struct.new(:name, :age)

class UserDash < Hashie::Dash
  property :name
  property :age
end

class UserAM
  include ActiveModel::Model
  attr_accessor :name, :age
end

USER = "User".freeze
AGE = 21
HASH = {:name => USER, :age => AGE}.freeze

Benchmark.bm 20 do |x|
  x.report 'OpenStruct slow' do
    REP.times do |index|
       OpenStruct.new(:name => "User", :age => 21)
    end
  end

  x.report 'OpenStruct fast' do
    REP.times do |index|
       OpenStruct.new(HASH)
    end
  end

  x.report 'Struct slow' do
    REP.times do |index|
       User.new("User", 21)
    end
  end

  x.report 'Struct fast' do
    REP.times do |index|
       User.new(USER, AGE)
    end
  end

  x.report 'Hashie Dash' do
    REP.times do |index|
      UserDash.new(HASH)
    end
  end

  x.report 'Hashie Mash' do
    REP.times do |index|
      Hashie::Mash.new(HASH)
    end
  end

  x.report 'ActiveModel' do
    REP.times do |index|
      UserAM.new(HASH)
    end
  end
end