Rails Initializers Boot Perfromance

application.rb

# config/application.rb
module RailsApp
  class Application < Rails::Application
    ActiveSupport::Notifications.subscribe('load_config_initializer.railties') do |*args|
      event = ActiveSupport::Notifications::Event.new(*args)
      puts "Loaded initializer #{event.payload[:initializer]} (#{event.duration}ms)"
    end
  end
end