arbre_benchmark.rb

require 'arbre'
require 'benchmark'

def generate_html
  Arbre::Context.new do
    10000.times do |i|
      div class: 'article' do
        div "Article #{i}", class: 'article__title'
        div "Awesome content", class: 'article__content'
      end
    end
  end
end

def patch
  Arbre::Element.class_eval do
    def add_child(child)
      return unless child

      if child.is_a?(Array)
        child.each{|item| add_child(item) }
        return @children
      end

      unless child.is_a?(Arbre::Element)
        child = Arbre::HTML::TextNode.from_string(child)
      end

      if child.respond_to?(:parent)
        child.parent.remove_child(child) if child.parent and child.parent != self
        child.parent = self
      end

      @children << child
    end
  end
end

Benchmark.bm do |x|
  x.report { generate_html }
  x.report { patch; generate_html }
end

result.txt

$ ruby test.rb

       user     system      total        real
   2.870000   0.010000   2.880000 (  2.877290)
   0.340000   0.000000   0.340000 (  0.348035)