Rails 4 资产编译在开发模式下非常慢（>1 分钟）。如何排除故障？

Question

我正在使用带有引导程序的 Rails 4 应用程序。在某些时候，资产编译变得无聊，现在如果我对 SCSS 文件进行任何更改，重新加载页面需要一分钟多的时间。更改 JS 文件不会导致此延迟。我不知道是什么原因造成的，但是当我尝试自己预编译资产时，该过程大约需要 2 秒才能完成。不知道为什么当它在飞行中发生时需要一分钟以上，有时超过 2 分钟。

我正在使用带有 livereload 的守卫，当我在样式表中保存更改时，页面被 livereloaded 但没有任何样式表。如果我重新加载页面，渲染需要一分钟。我希望有一些明显的东西我只是错过了，有人发现了它。

在进行故障排除时，我切换了配置，以便在 application.css.scss 中加载 scss 文件（使用 *= require 语法），然后在每个文件中导入引导变量和 mixins，但这同样慢。我还尝试使用 CDN 引导程序，然后覆盖，但速度几乎一样慢，而且覆盖这么多类令人头疼。

延迟是在布局的渲染过程中，但它只发生在我对样式表进行更改时。任何其他更改都会立即加载。

我有一堆设计/css 工作需要做，而这个问题几乎是不可能的。请帮忙。

（我可能还应该在这里发布一些其他文件。请告诉我，我会发布它。）

这是我的 gemfile：

source 'https://rubygems.org'
ruby '2.0.0'
#ruby-gemset=networkrf

gem 'rails', '4.0.1'
gem 'pg', '0.15.1'
gem 'bootstrap-sass', '~> 3.2.0'
gem 'sass-rails', '>= 3.2'
gem 'autoprefixer-rails'

gem 'bcrypt-ruby', '3.1.2'
gem 'faker', '1.1.2'
gem 'will_paginate', '3.0.4'
gem 'bootstrap-will_paginate', '0.0.9'
gem 'font-awesome-rails'
gem 'httparty'
gem 'gmaps4rails'
gem 'geocoder'
gem 'sprockets_better_errors'

group :development, :test do
  gem 'thin'
end

group :development, :test do
  gem 'rspec-rails', '2.13.1'
  gem 'guard-rspec', '2.5.0'
  gem 'spork-rails', github: 'sporkrb/spork-rails'
  gem 'childprocess', '0.3.6'
  gem 'guard-livereload', require: false
  gem 'guard-spork', '1.5.0'
  gem 'rack-livereload'
  gem 'rb-fsevent', require: false
  gem 'factory_girl_rails', '4.2.1'
end

group :test do
  gem 'selenium-webdriver', '2.35.1'
  gem 'capybara', '2.1.0'
  gem 'growl', '1.0.3'
  gem 'capybara-screenshot'
  gem 'launchy'
end

# gem 'sass-rails', '4.0.0'
gem 'uglifier', '2.1.1'
gem 'coffee-rails', '4.0.0'
gem 'jquery-rails', '3.0.4'
gem 'turbolinks', '1.1.1'
gem 'jbuilder', '1.0.2'

group :doc do
  gem 'sdoc', '0.3.20', require: false
end

group :production do
  gem 'rails_12factor'
  gem 'unicorn'
  gem 'newrelic_rpm'
end

# gem 'fog'
# gem 'rmagick', '2.13.2'
# gem 'carrierwave'

这里是 development.rb

Networkrf::Application.configure do

  config.cache_classes = false

  config.eager_load = false

  config.consider_all_requests_local       = true
  config.action_controller.perform_caching = false

  config.action_mailer.raise_delivery_errors = false

  config.active_support.deprecation = :log

  config.active_record.migration_error = :page_load

  config.assets.compress = false
  config.assets.debug = true

  config.middleware.insert_after(ActionDispatch::Static, Rack::LiveReload)
  config.assets.raise_production_errors = true
end

应用程序.rb

require File.expand_path('../boot', __FILE__)
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "sprockets/railtie"
require "csv"

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(:default, Rails.env)

module Networkrf
  class Application < Rails::Application
    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration should go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded.

    # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
    # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
    # config.time_zone = 'Central Time (US & Canada)'

    # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
    # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
    # config.i18n.default_locale = :de

    config.assets.precompile += %w(*.png *.jpg *.jpeg *.gif)
  end
end

application.css.scss

/*
 * This is a manifest file that'll be compiled into application.css, which will include all the files
 * listed below.
 *
 * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
 * or vendor/assets/stylesheets of plugins, if any, can be referenced here using a relative path.
 *
 * You're free to add application-wide styles to this file and they'll appear at the top of the
 * compiled file, but it's generally better to create a new file per style scope.
 *
 *= require font-awesome
 *= require main
 */

main.css.scss

/**
*
* Loads all stylesheets for the application in order
*
**/


@import "bootstrap-custom";
@import "variables";
@import "theme";
@import "base";
@import "components";
@import "nav";
@import "home";
@import "scenes";
@import "custom";
@import "typography";
@import "utility";

rack-mini-test gem 输出：

还有什么我可以补充的吗？或任何要运行的测试？

Answer 1

根据我的经验，//= require 在开发环境中比@import 快，但在某些情况下可能会很麻烦