Understaning log file response times

Hi everyone, I'm trying to understand where my application spends time while being generated. In the log file I see entries such as: Completed in 368ms (View: 32, DB: 1) | 200 OK [http://www.sitename.com/\]. Since everything is cached, the view and DB time are very small. My question is can I assume the rest of the time is spent in the controller? Is there a way to dig deeper into the data (other than paying new relic a hefty some for their services).

Thanks!