# File lib/new_relic/agent/instrumentation/curb.rb, line 108
      def perform_with_newrelic(&blk)
        return perform_without_newrelic if
          self.requests.first &&
          self.requests.first.respond_to?(:_nr_serial) &&
          self.requests.first._nr_serial

        trace_execution_scoped("External/Multiple/Curb::Multi/perform") do
          perform_without_newrelic(&blk)
        end
      end