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diff --git a/benchmark/benchmark.rb b/benchmark/benchmark.rb
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+#!/usr/bin/env ruby
+
+=begin
+
+Use this script to monitor changes in performance when making code changes to Asciidoctor.
+
+ $ ruby benchmark.rb <benchmark-name> <repeat>
+
+The most common benchmark is the userguide-loop.
+It will download the AsciiDoc User Guide automatically the first time, then convert it in memory.
+Running it 10 times provides a good picture.
+
+ $ ruby benchmark.rb userguide-loop 10
+
+Only worry about the relative change to the numbers before and after the code change.
+Absolute times are highly dependent on the capabilities of the machine the the version of Ruby.
+
+To get the best results under MRI, tune Ruby using environment variables as follows:
+
+.Ruby < 2.1
+ $ RUBY_GC_MALLOC_LIMIT=90000000 RUBY_FREE_MIN=650000 ruby benchmark.rb userguide-loop 10
+
+.Ruby >= 2.1
+ $ RUBY_GC_MALLOC_LIMIT=128000000 RUBY_GC_OLDMALLOC_LIMIT=128000000 RUBY_GC_HEAP_INIT_SLOTS=800000 RUBY_GC_HEAP_FREE_SLOTS=800000 RUBY_GC_HEAP_GROWTH_MAX_SLOTS=250000 RUBY_GC_HEAP_GROWTH_FACTOR=1.25 ruby benchmark.rb userguide-loop 10
+
+Asciidoctor starts with ~ 12,500 objects, adds ~ 300,000 each run, so tune RUBY_GC_HEAP_* accordingly
+
+Execute Ruby using the `--disable=gems` flag to speed up the initial load time, as shown below:
+
+ $ ruby --disable=gems ...
+
+=end
+
+require 'benchmark'
+include Benchmark
+
+bench = ARGV[0]
+$repeat = ARGV[1].to_i || 10000
+
+if bench.nil?
+  raise 'You must specify a benchmark to run.'
+end
+
+def fetch_userguide
+  require 'open-uri'
+  userguide_uri = 'https://raw.githubusercontent.com/asciidoc/asciidoc/d43faae38c4a8bf366dcba545971da99f2b2d625/doc/asciidoc.txt'
+  customers_uri = 'https://raw.githubusercontent.com/asciidoc/asciidoc/d43faae38c4a8bf366dcba545971da99f2b2d625/doc/customers.csv'
+  userguide_content = open(userguide_uri) {|fd2| fd2.read }
+  customers_content = open(customers_uri) {|fd2| fd2.read }
+  File.open('sample-data/userguide.adoc', 'w') {|fd1| fd1.write userguide_content }
+  File.open('sample-data/customers.csv', 'w') {|fd1| fd1.write customers_content }
+end
+
+case bench
+
+=begin
+# benchmark template
+
+when 'name'
+
+  sample = 'value'
+
+  Benchmark.bmbm(12) {|bm|
+    bm.report('operation a') { $repeat.times { call_a_on sample } }
+    bm.report('operation b') { $repeat.times { call_b_on sample } }
+  }
+=end
+
+when 'userguide'
+  require '../lib/asciidoctor.rb'
+  Asciidoctor::Compliance.markdown_syntax = false
+  sample_file = ENV['BENCH_TEST_FILE'] || 'sample-data/userguide.adoc'
+  backend = ENV['BENCH_BACKEND'] || 'html5'
+  fetch_userguide if sample_file == 'sample-data/userguide.adoc' && !(File.exist? sample_file)
+  result = Benchmark.bmbm {|bm|
+    bm.report(%(Convert #{sample_file} (x#{$repeat}))) {
+      $repeat.times {
+        Asciidoctor.render_file sample_file, :backend => backend, :safe => Asciidoctor::SafeMode::SAFE, :eruby => 'erubis', :header_footer => true, :to_file => false, :attributes => {'linkcss' => '', 'toc' => nil, 'numbered' => nil, 'icons' => nil, 'compat-mode' => 'legacy'}
+      }
+    }
+  }
+  # prints average for real run
+  puts %(>avg: #{result.first.real / $repeat})
+
+when 'userguide-loop'
+  require '../lib/asciidoctor.rb'
+  GC.start
+  Asciidoctor::Compliance.markdown_syntax = false
+  sample_file = ENV['BENCH_TEST_FILE'] || 'sample-data/userguide.adoc'
+  backend = ENV['BENCH_BACKEND'] || 'html5'
+  fetch_userguide if sample_file == 'sample-data/userguide.adoc' && !(File.exist? sample_file)
+
+  best = nil
+  2.times.each do
+    outer_start = Time.now
+    (1..$repeat).each do
+      inner_start = Time.now
+      Asciidoctor.render_file sample_file, :backend => backend, :safe => Asciidoctor::SafeMode::SAFE, :eruby => 'erubis', :header_footer => true, :to_file => false, :attributes => {'linkcss' => '', 'toc' => nil, 'numbered' => nil, 'icons' => nil, 'compat-mode' => 'legacy'}
+      puts (elapsed = Time.now - inner_start)
+      best = (best ? [best, elapsed].min : elapsed)
+    end
+    puts %(Run Total: #{Time.now - outer_start})
+  end
+  puts %(Best Time: #{best})
+
+when 'mdbasics-loop'
+  require '../lib/asciidoctor.rb'
+  GC.start
+  sample_file = ENV['BENCH_TEST_FILE'] || 'sample-data/userguide.adoc'
+  backend = ENV['BENCH_BACKEND'] || 'html5'
+
+  best = nil
+  2.times do
+    outer_start = Time.now
+    (1..$repeat).each do
+      inner_start = Time.now
+      Asciidoctor.render_file sample_file, :backend => backend, :safe => Asciidoctor::SafeMode::SAFE, :header_footer => false, :to_file => false, :attributes => {'linkcss' => '', 'idprefix' => '', 'idseparator' => '-', 'showtitle' => ''}
+      puts (elapsed = Time.now - inner_start)
+      best = (best ? [best, elapsed].min : elapsed)
+    end
+    puts %(Run Total: #{Time.now - outer_start})
+  end
+  puts %(Best Time: #{best})
+
+end