Rails development speedups

development_view_resolve_caching.rb

# include this mixin (or put the code directly) into your application_controller.rb

module Shared
  module DevelopmentViewResolveCaching
    extend ActiveSupport::Concern

    # Speeds up development view rendering by about ~300ms as we don't need
    # to call the slow view resolver more than once per partial.
    #
    # From https://github.com/rails/rails/issues/20752
    included do
      if Rails.env.development?
        prepend_before_action { ActionView::Resolver.caching = true }
        after_action { ActionView::Resolver.caching = false }
      end
    end
  end
end

unregister_extra_view_handlers.rb

# Put this in config/initializers, customise to your own needs

# Unregistering these unused handlers speeds up view template resolution.
ActionView::Template.unregister_template_handler(:raw, :ruby, :coffee)