rails_performance_tweaks.md

Tweaking Rails performance

Gems for better speed

• escape_utils
• Oj - a fast JSON parser
• fast_blank

Using Rails for an API drop unneeded modules

Use ActionController::Metal

class Api::V1::BaseController < ActionController::Metal
  include ActionController::Rendering        # enables rendering
  include ActionController::MimeResponds     # enables serving different content types like :xml or :json
  include AbstractController::Callbacks      # callbacks for your authentication logic
 
  append_view_path "#{Rails.root}/app/views" # you have to specify your views location as well
end

DB

• GiST vs. GIN indexes

Use less branching (micro-optimization)

• The Cost of If

Profiling

• rblineprof

• oink

• peek

  • peek rblineprof
  • peek rblineprof with rouge support
  • peek performance bar
  • peek pg
  • peek GC
  • peek Git

Note : when using Peek with Unicorn or something similar change the adapter from memory to redis or dalli

Credits

• API with Ruby on Rails: useful tricks
• Escape Velocity
• How we keep GitHub fast
• Hey Judy, don't make it bad
• Ruby strings