Separate Assets Host

deploy.sh

# Use rsync during your deployment process to sync
rake assets:precompile
rsync -avzhe ssh /home/rails/my_app/public/* user@assets.example.com:/public_html/

# Now your Rails app will fetch assets from the assets server

production.rb

# Set Rails to use your new assets host

Rails.application.configure do
  # ...

  # Generate digests for assets URLs.
  config.assets.digest = true

  config.action_controller.asset_host = "//assets.example.com"
  config.action_mailer.asset_host = config.action_controller.asset_host

  # ...
end