I'm very impressed with the caching capabilities in Rails 3. Not only can it cache pages like any good Rack application can, it can also cache actions - which will include factors like authentication of sessions, and it can also cache... partials!
Seriously, isn't that awesome?
There are some other great aspects, too:
In my experience, caching can be a pain because it can happen when it shouldn't. However, it has also been my experience that it is the most effective way to improve performance.
1 class AccountsController < InheritedResources::Base 2 defaults :resource_class => Account, :collection_name => 'accounts', :instance_name => 'account' 3 4 before_filter :clear_accounts_cache, :only => [:create, :update, :hide] 5 caches_action :index 6 ... 39 private 40 def clear_accounts_cache 41 expire_action :action => :index 42 end 43 end