Initializer for rails if you use newrelic outside Heroku or without Mongrel. Will speed up all instrumented request by about 100%

newrelic.rb

module NewRelic
  module Agent
    module Instrumentation
      # == NewRelic instrumentation for controller actions and tasks
      #
      # This instrumentation is applied to the action controller to collect
      # metrics for every web request.
      #
      # It can also be used to capture performance information for
      # background tasks and other non-web transactions, including
      # detailed transaction traces and traced errors.
      #
      # For details on how to instrument background tasks see
      # ClassMethods#add_transaction_tracer and
      # #perform_action_with_newrelic_trace
      #
      module ControllerInstrumentation
        # Do not loose time here. Fix newrelic ObjectSpace.each search at each request.
        def _record_queue_length
          return
        end
      end
    end
  end
end

• Related to (private) issues https://support.newrelic.com/requests/41133 (May 2013) and https://newrelic.zendesk.com/tickets/14648 (August 2012).

The culprit is https://github.com/newrelic/rpm/blob/master/lib/new_relic/agent/instrumentation/controller_instrumentation.rb#L475 that does a lazy assignment of a nil value when not using Mongrel.

LAZY+NIL = STILL LAZY.