How to Write Fast Code in Ruby on Rails - Shopify

This post details strategies for writing faster code in Ruby on Rails, focusing on Active Record performance (lazy evaluation, selecting fewer columns, avoiding query cache, indexing), Rails performance (caching, throttling, background jobs, dependency management), and Ruby performance (sparing use of metaprogramming, understanding O(n) vs O(1) complexity, minimizing object allocations). It provides specific code examples and references tools like LHM, rack-attack, Sidekiq, and benchmark-ips.