Hashie vs OpenStruct vs PORO performance

benchmark.rb

require 'hashie'
require 'ostruct'
require 'benchmark/ips'

class PORO
  attr_reader :foo, :bar, :baz

  def initialize attrs={}
    attrs.each do |attr, value|
      instance_variable_set "@#{attr}", value
    end
  end
end

attrs = { foo: 1, bar: true, baz: 'quux' }
hashie = Hashie::Mash.new(attrs)
ostruct = OpenStruct.new(attrs)
poro = PORO.new(attrs)

Benchmark.ips do |x|
  x.report 'Hashie alloc' do
    Hashie::Mash.new(attrs)
  end

  x.report 'OpenStruct alloc' do
    OpenStruct.new(attrs)
  end

  x.report 'PORO alloc' do
    PORO.new(attrs)
  end

  x.report 'Hashie access' do
    hashie.foo
    hashie.bar
    hashie.baz
  end

  x.report 'OStruct access' do
    ostruct.foo
    ostruct.bar
    ostruct.baz
  end

  x.report 'PORO access' do
    poro.foo
    poro.bar
    poro.baz
  end
end