How to see our code performance in Production Environment

when new relic shows a slow report like this you can take a look at the Transactions section then click one of them if you hover your mouse to this chart, it means Ruby code has spent 32 seconds to load and MySQL 33 seconds and then scroll down and click one of the transaction link you will find out what is the cause of the slow response on trace details and database queries one controller normally has 1-3 DB queries, if more than that, you need to improve the code. You can utilize identity_cache gem or Rails cache to improve the performance if trace details is not clear, you can add a custom tracing to your Ruby method, see more at

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Ruby custom instrumentation

For information about customizing New Relic's Ruby agent API to collect additional metrics, start here.

https://docs.newrelic.com/docs/apm/agents/ruby-agent/api-guides/ruby-custom-instrumentation/

](https://docs.newrelic.com/docs/apm/agents/ruby-agent/api-guides/ruby-custom-instrumentation/)