Faster way to compile assets

assets.rake

require "fileutils"

namespace :assets do
  namespace :precompile do
    desc "Faster way to compile assets"
    task fast: ["assets:environment", "tmp:cache:clear", "assets:precompile:primary"] do
      config = Rails.application.config 
      if config.assets.digest
        assets_path = File.join(Rails.public_path, config.assets.prefix)
        manifest_path =  config.assets.manifest || assets_path

        manifest = YAML.load_file "#{manifest_path}/manifest.yml"
        manifest.each do |file, digest_file|
          FileUtils.cp "#{assets_path}/#{digest_file}", "#{assets_path}/#{file}"
        end
      end
    end
  end
end