Your app is slow. It does not spark joy. In this talk, we will use memory profiling tools to discover performance hotspots. We will use this technique with a real-world application to identify a piece of optimizable code in Active Record that leads to a patch with substantial page speed impact.

Schneems writes Ruby at Heroku, maintains CodeTriage.com, and co-organizes Keep Ruby Weird. He is in the top 50 Rails contributors and is an accidental maintainer of Sprockets and Puma. When he isn’t …