data_structures.rb

require 'benchmark'
require 'api_smith'
require 'virtus'

class StructData < Struct.new(:id, :date, :boolean)
end

class APISmithData < APISmith::Smash
  property :id
  property :date
  property :boolean
end

class VirtusData
  include Virtus.model

  attribute :id, Integer
  attribute :date, DateTime
  attribute :boolean, Boolean
end

n   = 1_000_000
now = Time.now

Benchmark.bmbm do |x|
  x.report("struct") do
    n.times { StructData.new(id: 1, date: now, boolean: true) }
  end
  x.report("api_smith") do
    n.times { APISmithData.new(id: 1, date: now, boolean: true) }
  end
  x.report("virtus") do
    n.times { VirtusData.new(id: 1, date: now, boolean: true) }
  end
end

RESULTS

Rehearsal ---------------------------------------------
struct      0.800000   0.110000   0.910000 (  0.908901)
api_smith  11.370000   0.030000  11.400000 ( 11.416546)
virtus     62.730000   0.080000  62.810000 ( 62.869756)
----------------------------------- total: 75.120000sec

                user     system      total        real
struct      0.780000   0.030000   0.810000 (  0.816881)
api_smith  11.130000   0.010000  11.140000 ( 11.157779)
virtus     60.450000   0.030000  60.480000 ( 60.487696)