Testing immutable data structure called 'Values' -> https://github.com/tcrayford/values/

benchmark.rb

require 'ostruct'
require 'benchmark'
require 'values'

COUNT = 10_000_000
NAME = "Test Name"
EMAIL = "test@example.org"

class Person
  attr_accessor :name, :email
end

Vp = Value.new(:name, :email)

Benchmark.bm(13) do |x|
    x.report("Value:") do
    COUNT.times do
      Vp.new(NAME, EMAIL)
   end
  end

  x.report("hash:") do
    COUNT.times do
      p = {name: NAME, email: EMAIL}
    end
  end

  x.report("openstruct:") do
    COUNT.times do
     p = OpenStruct.new
     p.name = NAME
     p.email = EMAIL
   end
  end

  x.report("struct:") do
    PersonStruct = Struct.new(:name, :email)
    COUNT.times do
      p = PersonStruct.new
      p.name = NAME
      p.email = EMAIL
    end
  end

  x.report("class:") do
    COUNT.times do
      p = Person.new
      p.name = NAME
      p.email = EMAIL
    end
  end
end

result.txt

$ ruby benchmark.rb
                    user     system      total        real
Value:         22.270000   0.280000  22.550000 ( 23.955640)
hash:           6.690000   0.250000   6.940000 (  7.792043)
openstruct:   138.330000   1.930000 140.260000 (148.726408)
struct:         2.860000   0.040000   2.900000 (  2.957147)
class:          2.410000   0.030000   2.440000 (  2.571136)