Use caching !

Caching is really simple, see page caching.

In your production.rb file add :

config.action_controller.perform_caching = true
config.action_controller.cache_store = :file_store, RAILS_ROOT+"/tmp/cache/"
config.action_controller.page_cache_directory = RAILS_ROOT+"/public/cache/"

And in the controllers where you want to activate page caching just add :

caches_page :index, :help, :home, :faq

And that's it ! Next time you'll access the cached pages without requesting your rails server.

For more advanced info just read the guide :

http://guides.rubyonrails.org/caching_with_rails.html