roar vs ams

bench.rb

require "bundler"
require "active_model_serializers"
require "roar"
require "roar/json/json_api"
require "benchmark"
require "ffaker"

Post = Struct.new(:id, :author, :body, :draft) do
  include ActiveModel::Serializers::JSON
end

posts = []

(1..100_000).each do |id|
  posts << Post.new(id: id, author: Faker::Name.name, body: Faker::HipsterIpsum.paragraph, draft: [true, false].sample)
end

class PostSerializer < ActiveModel::Serializer
  attributes :id, :author, :body, :draft
end

module PostsRepresenter
  include Roar::JSON::JSONAPI
  type :posts

  property :id
  property :author
  property :body
  property :draft
end

puts "with 100_000 records"

Benchmark.bm do |x|
  x.report("ActiveModel::Serializer") { ActiveModel::ArraySerializer.new(posts, each_serializer: PostSerializer).to_json }
  x.report("Roar::JSON::JSONAPI") { PostsRepresenter.for_collection.prepare(posts).to_json }
end

puts "with 2000 records"

first2k = posts.take(2000)

Benchmark.bm do |x|
  x.report("ActiveModel::Serializer") { ActiveModel::ArraySerializer.new(first2k, each_serializer: PostSerializer).to_json }
  x.report("Roar::JSON::JSONAPI") { PostsRepresenter.for_collection.prepare(first2k).to_json }
end

results

with 100_000 records
       user     system      total        real
ActiveModel::Serializer  6.000000   0.130000   6.130000 (  6.168347)
Roar::JSON::JSONAPI 20.710000   0.240000  20.950000 ( 21.055724)
with 2000 records
       user     system      total        real
ActiveModel::Serializer  0.100000   0.010000   0.110000 (  0.102477)
Roar::JSON::JSONAPI  0.220000   0.000000   0.220000 (  0.219107)