There are several ways you can measure your rails application's performance. The techniques range from filling your code with "puts" statements - :p - to fancy ones like NewRelic - which is quite nice, I must say. But what many people don't know is that rails ships with a handful of scripts to help you out. One of which is called profiler, located under your application's scripts/performance directory. By default it uses the standard ruby profiler but if you want more speed - and additional reporting options - , consider installing the ruby-prof gem.