Engine eager load by default on rails 3, so lets turn that off to save some precious startup time.
# config/environments/test.rb + development.rb config.eager_load = false
# config/application.rb if !config.eager_load && Rails::VERSION::MAJOR == 3 Rails::Railtie.descendants.each do |railtie| railtie.class_eval { def eager_load!; end } end end