performance - Understanding Rails runtime metrics -

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i'm trying diagnose performance issue in rails 4 , can't figure out what's going on. here's timing i'm seeing on server:

completed 200 ok in 2816ms (views: 644.1ms | activerecord: 162.0ms | solr: 0.0ms)

i'm (mostly) satisfied views time, , activerecord time, don't understand why completed time (2816ms) large.

what time represent? , there way decrease time?

what you're showing on 2/3 of request processing time isn't included in model/view. what's left? other code running within controller , request processing life-cycle.

the best way profile install newrelic rpm gem , run local profiler:

add gem gemfile:

gem 'newrelic_rpm'

enable local profiling in development config/newrelic.yml:

development:   <<: *default_settings   monitor_mode: false   developer_mode: true

execute request 2-3 times warm rails app , visit local newrelic app view traces , track down what's happening:

http://localhost:3000/newrelic

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