rack-pagespeed: Rack middleware for page speed optimization

Thanks to work by Google and Yahoo, we’re all better informed about how to speed up our web pages. For those on Apache, Google has made it easier to implement these ideas at the Apache Module level. For those running on Ruby web frameworks, Julio Cesar offers up the same goodness as Rack middleware.

Rack Pagespeed offers some HTML output filters to help you implement page optimization best practices with minimal effort. To get started, install the gem:

gem install rack-pagespeed

For Sinatra, Rack, or Padrino apps, configure Rack Pagespeed in your config.ru Rackup file:

require 'rack/pagespeed'
require 'myapp'
use Rack::PageSpeed, :public => "/app/public/dir" do
  store :disk => Dir.tmpdir # require 'tmpdir'
  inline_javascript :max_size => 4000
  inline_css
  combine_javascripts
end
run Sinatra::Application

For those Rails, create a rack_pagespeed.rb initializer with:

require 'rack/pagespeed' # somewhere
class Application < Rails::Application
  config.middleware.use Rack::PageSpeed, :public => Rails.public_path do
    store :disk => Dir.tmpdir # require 'tmpdir'
    inline_javascript :max_size => 4000
    inline_css
    combine_javascripts
  end
  # ...

Filters

Out of the box, Rack Pagespeed supports filters to:

• Inline JavaScript under 2kb
• Inline CSS under 2kb
• Bundle JavaScript files
• Minify JavaScript files
• Bundle CSS files
• Inline images using data-uri

You can even roll your own filters.

Storage

Rack Pagespeed currently supports two storage options: disk and memcached. See the well designed docs for advanced options.

[Source on GitHub] [Web site]