diff --git a/demo/.gitignore b/demo/.gitignore
new file mode 100644
index 0000000..74094e8
--- /dev/null
+++ b/demo/.gitignore
@@ -0,0 +1,2 @@
+log
+tmp
diff --git a/demo/Gemfile b/demo/Gemfile
new file mode 100644
index 0000000..f1e71bf
--- /dev/null
+++ b/demo/Gemfile
@@ -0,0 +1,8 @@
+source 'https://rubygems.org'
+
+gem 'rails'
+gem 'sinatra'
+gem 'celluloid'
+gem 'launchy'
+gem 'sidekiq-limit_fetch'
+
diff --git a/demo/README.md b/demo/README.md
new file mode 100644
index 0000000..5aabe03
--- /dev/null
+++ b/demo/README.md
@@ -0,0 +1,2 @@
+To test effect of limits run: `rake demo:limits`
+To change simulation see `lib/tasks/demo.rake`
diff --git a/demo/Rakefile b/demo/Rakefile
new file mode 100644
index 0000000..70b7427
--- /dev/null
+++ b/demo/Rakefile
@@ -0,0 +1,6 @@
+# Add your own tasks in files placed in lib/tasks ending in .rake,
+# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
+
+require File.expand_path('../config/application', __FILE__)
+
+Demo::Application.load_tasks
diff --git a/demo/app/workers/fast_worker.rb b/demo/app/workers/fast_worker.rb
new file mode 100644
index 0000000..bb4b60d
--- /dev/null
+++ b/demo/app/workers/fast_worker.rb
@@ -0,0 +1,8 @@
+class FastWorker
+  include Sidekiq::Worker
+  sidekiq_options queue: :fast
+
+  def perform
+    sleep 0.2
+  end
+end
diff --git a/demo/app/workers/slow_worker.rb b/demo/app/workers/slow_worker.rb
new file mode 100644
index 0000000..9551a5e
--- /dev/null
+++ b/demo/app/workers/slow_worker.rb
@@ -0,0 +1,8 @@
+class SlowWorker
+  include Sidekiq::Worker
+  sidekiq_options queue: :slow
+
+  def perform
+    sleep 1
+  end
+end
diff --git a/demo/config.ru b/demo/config.ru
new file mode 100644
index 0000000..5bc2a61
--- /dev/null
+++ b/demo/config.ru
@@ -0,0 +1,4 @@
+# This file is used by Rack-based servers to start the application.
+
+require ::File.expand_path('../config/environment',  __FILE__)
+run Rails.application
diff --git a/demo/config/application.rb b/demo/config/application.rb
new file mode 100644
index 0000000..d9e9d6a
--- /dev/null
+++ b/demo/config/application.rb
@@ -0,0 +1,28 @@
+require File.expand_path('../boot', __FILE__)
+
+# Pick the frameworks you want:
+# require "active_record/railtie"
+require "action_controller/railtie"
+require "action_mailer/railtie"
+require "sprockets/railtie"
+# require "rails/test_unit/railtie"
+
+# Require the gems listed in Gemfile, including any gems
+# you've limited to :test, :development, or :production.
+Bundler.require(:default, Rails.env)
+
+module Demo
+  class Application < Rails::Application
+    # Settings in config/environments/* take precedence over those specified here.
+    # Application configuration should go into files in config/initializers
+    # -- all .rb files in that directory are automatically loaded.
+
+    # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
+    # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
+    # config.time_zone = 'Central Time (US & Canada)'
+
+    # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
+    # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
+    # config.i18n.default_locale = :de
+  end
+end
diff --git a/demo/config/boot.rb b/demo/config/boot.rb
new file mode 100644
index 0000000..3596736
--- /dev/null
+++ b/demo/config/boot.rb
@@ -0,0 +1,4 @@
+# Set up gems listed in the Gemfile.
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
+
+require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])
diff --git a/demo/config/environment.rb b/demo/config/environment.rb
new file mode 100644
index 0000000..56916e7
--- /dev/null
+++ b/demo/config/environment.rb
@@ -0,0 +1,5 @@
+# Load the Rails application.
+require File.expand_path('../application', __FILE__)
+
+# Initialize the Rails application.
+Demo::Application.initialize!
diff --git a/demo/config/environments/development.rb b/demo/config/environments/development.rb
new file mode 100644
index 0000000..6a7f397
--- /dev/null
+++ b/demo/config/environments/development.rb
@@ -0,0 +1,27 @@
+Demo::Application.configure do
+  # Settings specified here will take precedence over those in config/application.rb.
+
+  # In the development environment your application's code is reloaded on
+  # every request. This slows down response time but is perfect for development
+  # since you don't have to restart the web server when you make code changes.
+  config.cache_classes = false
+
+  # Do not eager load code on boot.
+  config.eager_load = false
+
+  # Show full error reports and disable caching.
+  config.consider_all_requests_local       = true
+  config.action_controller.perform_caching = false
+
+  # Don't care if the mailer can't send.
+  config.action_mailer.raise_delivery_errors = false
+
+  # Print deprecation notices to the Rails logger.
+  config.active_support.deprecation = :log
+
+
+  # Debug mode disables concatenation and preprocessing of assets.
+  # This option may cause significant delays in view rendering with a large
+  # number of complex assets.
+  config.assets.debug = true
+end
diff --git a/demo/lib/tasks/demo.rake b/demo/lib/tasks/demo.rake
new file mode 100644
index 0000000..f564f7f
--- /dev/null
+++ b/demo/lib/tasks/demo.rake
@@ -0,0 +1,57 @@
+namespace :demo do
+  task limit: :environment do
+    puts '=> Creating sidekiq tasks'
+
+    100.times do
+      SlowWorker.perform_async
+      FastWorker.perform_async
+    end
+
+    run_sidekiq_monitoring
+    run_sidekiq_workers config: <<-YAML
+      :verbose: false
+      :concurrency: 4
+      :queues:
+        - slow
+        - fast
+      :limits:
+        slow: 1
+    YAML
+  end
+
+  def with_sidekiq_config(config)
+    whitespace_offset = config[/\A */].size
+    config.gsub! /^ {#{whitespace_offset}}/, ''
+
+    puts "=> Use sidekiq config:\n#{config}"
+    File.write 'config/sidekiq.yml', config
+    yield
+  ensure
+    FileUtils.rm 'config/sidekiq.yml'
+  end
+
+  def run_sidekiq_monitoring
+    require 'sidekiq/web'
+    Thread.new do
+      Rack::Server.start app: Sidekiq::Web, Port: 3000
+    end
+    sleep 1
+    Launchy.open 'http://127.0.0.1:3000/workers?poll=true'
+  end
+
+  def run_sidekiq_workers(options)
+    require 'sidekiq/cli'
+    cli = Sidekiq::CLI.instance
+
+    %w(validate! boot_system).each do |stub|
+      cli.define_singleton_method(stub) {}
+    end
+
+    with_sidekiq_config options[:config] do
+      config = cli.send :parse_config, 'config/sidekiq.yml'
+      Sidekiq.options.merge! config
+    end
+
+    cli.run
+  end
+end