expensive to put tracers on all class methods ?

gistfile1.rb

if defined?(NewRelic)
  Sircle.class_eval do
    class << self
      include NewRelic::Agent::MethodTracer
      # all methods defined in sircle.rb
      self.methods(false).each do |method|
        add_method_tracer method.to_s, "Custom/Sircle/#{method}"
      end
    end
  end
end