First, create a new Cloudfront distribution via Amazon AWS console (gist here). Once you've done that, it's as simple as adding the following to your production environment (and staging if you run a staging environment), replacing the value with your CDN host url:
config.action_controller.asset_host = "<YOUR DISTRIBUTION SUBDOMAIN>.cloudfront.net"
See here for more info: https://devcenter.heroku.com/articles/using-amazon-cloudfront-cdn#adding-cloudfront-to-rails
This boosts performance. Helpful post here: http://thediscoblog.com/blog/2013/05/01/the-rails-cloudfront-and-heroku-performance-hat-trick/
To add gzip via Heroku Deflater gem:
Gemfile.rb:
gem 'heroku-deflater', group: [:production, :staging]config/environments/production.rb and config/environments/staging.rb:
config.static_cache_control = 'public, max-age=31536000'
config.middleware.delete "ActionDispatch::Static"
config.middleware.insert_before(Rack::Runtime, ActionDispatch::Static, paths["public"].first, config.static_cache_control)You can see the result on our site: www.launchpadlab.com