Please don’t hate OpenStruct

benchmark.rb

require 'benchmark'
require 'benchmark/ips'
require 'ostruct'
require 'active_model'

BillingAddressStruct = Struct.new(:street, :city, :zipcode, :country, :state)

BillingAddressOpenStruct = OpenStruct

BillingAddressStructFromHash = Struct.new(:street, :city, :zipcode, :country, :state) do
  def self.from_hash(attributes)
    instance = new
    attributes.each do |key, value|
      instance[key] = value
    end
    instance
  end
end

class BillingAddress
  attr_accessor :street, :city, :zipcode, :country, :state
end

class BillingAddressActiveModel
  include ActiveModel::Model

  attr_accessor :street, :city, :zipcode, :country, :state
end

Benchmark.ips do |x|
  x.report("BillingAddressStruct") do
    BillingAddressStruct.new(
      'Street',
      'City',
      'Zipcode',
      'Country',
      'State'
    )
  end
  x.report("BillingAddressStructFromHash:") do
    BillingAddressStructFromHash.from_hash(
      street: 'Street',
      city: 'City',
      zipcode: 'Zipcode',
      country: 'Country',
      state: 'State'
    )
  end
  x.report("BillingAddressOpenStruct") do
    BillingAddressOpenStruct.new(
      street: 'Street',
      city: 'City',
      zipcode: 'Zipcode',
      country: 'Country',
      state: 'State'
    )
  end
  x.report("BillingAddress") do
    BillingAddress.new.tap do |billing_address|
      billing_address.street = 'Street'
      billing_address.city = 'City'
      billing_address.zipcode = 'Zipcode'
      billing_address.country = 'Country'
      billing_address.state = 'State'
    end
  end
  x.report("BillingAddressActiveModel") do
    BillingAddressActiveModel.new(
      street: 'Street',
      city: 'City',
      zipcode: 'Zipcode',
      country: 'Country',
      state: 'State'
    )
  end
  x.compare!
end

Calculating -------------------------------------
BillingAddressStruct 1.504M (± 3.8%) i/s - 7.519M in 5.005860s
BillingAddressStructFromHash:
472.831k (± 2.5%) i/s - 2.365M in 5.006072s
BillingAddressOpenStruct
417.784k (± 4.9%) i/s - 2.118M in 5.082804s
BillingAddress 1.257M (± 2.6%) i/s - 6.291M in 5.007943s
BillingAddressActiveModel
124.096k (± 2.6%) i/s - 628.368k in 5.067165s

Comparison:
BillingAddressStruct: 1504236.7 i/s
BillingAddress: 1257026.5 i/s - 1.20x slower
BillingAddressStructFromHash:: 472830.7 i/s - 3.18x slower
BillingAddressOpenStruct: 417784.0 i/s - 3.60x slower
BillingAddressActiveModel: 124096.4 i/s - 12.12x slower

A more compact version of the BillingAddressStructFromHash with same performance if interested

BillingAddressStructFromHash = Struct.new(:street, :city, :zipcode, :country, :state) do
  def self.from_hash(attributes)
    new(*attributes.values_at(*members))
  end
end