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