How to Measure Ruby App Performance with New Relic

New Relic is a great tool for getting the overview of the performance bottlenecks of a Ruby application. But it's pretty extensive - where do you start?It’s 12pm on a Monday. Your boss walks by: “The site feels…slow. I don’t know, it just does.” Hmmm. You riposte with the classic developer reply: “Well, it’s fast on my local machine.” Boom! Boss averted! Unfortunately, you were a little dishonest. You know better than to think that speed in the local environment has anything to do with speed in production. You know that, right? Wait, we’re not on the same page here?Several factors can cause Ruby applications to have performance discrepancies between production and development:.