Profile a controller action

application_controller.rb

# ApplicationController
# Source: http://stackoverflow.com/questions/31320/how-to-profile-a-rails-controller-action

around_filter :profile if Rails.env.development?

def profile
  if params[:profile] && result = RubyProf.profile { yield }
    out = StringIO.new
    RubyProf::GraphHtmlPrinter.new(result).print out, :min_percent => 0
    self.response_body = out.string
  else
    yield
  end
end