Monitoring Rails Performance with Munin and a MongrelRails makes things easy on developers—maybe too easy. It’s not uncommon to reference an association while iterating over a collection of objects, resulting in a performance-devouring N+1 queries being executed. Of course, this is easily fixed with eager loading of the association, but you get my point. Rails can be a big gun, and it’s easy to blow off your foot. Once your application is moved into
