arbre_benchmark.rb

require 'arbre'
require 'benchmark'

def generate_html
  context = Arbre::Context.new do
    100000.times do |i|
      div class: 'article' do
        div "Article #{i}", class: 'article__title'
        div "Awesome content", class: 'article__content'
      end
    end
  end

  context.to_s
end

if ENV['APPLY_PATCH']
  Arbre::HTML::Tag.class_eval do
    def indent(open_tag, child_content, close_tag)
      open_tag + child_content + close_tag
    end
  end
end

Benchmark.bmbm do |x|
  x.report { generate_html }
end

results.md

$ ruby arbre_benchmark.rb

Rehearsal ------------------------------------
   6.358706   0.182712   6.541418 (  6.555321)
--------------------------- total: 6.541418sec

       user     system      total        real
   5.747130   0.016499   5.763629 (  5.776037)

$ APPLY_PATCH=yes ruby arbre_benchmark.rb

Rehearsal ------------------------------------
   5.964307   0.156302   6.120609 (  6.127731)
--------------------------- total: 6.120609sec

       user     system      total        real
   5.192958   0.003310   5.196268 (  5.202189)

5.192958/5.747130 = 10%