Don't check if asset is precompiled on development.

rails_asset_precomiled_patch.rb

# config/initializers/assets.rb

if Rails.env.development?
  Rails.application.config.assets.precompile = []

  # Don't check if asset is precompiled on development,
  # because building "precompiled_assets" list is taking quite long time.
  #
  # Default: https://github.com/rails/sprockets-rails/blob/89ba006950caba495954fbb1626919bfe4ee7838/lib/sprockets/railtie.rb#L31
  # "Called from asset helpers to alert you if you reference an asset URL that
  # isn't precompiled and hence won't be available in production."
  ::Rails::Application.class_eval do
    def asset_precompiled?(_logical_path)
      true
    end
  end
end