这真的很慢，需要几十秒钟：
- name: Install bower.json for the plugins. sudo: no become_user: www-data bower: path=/var/www/mortgage-calculator/src/mortgage-plugin-ember-admin 相比之下，如果我chdir到相同的位置，并运行bower install而不是通过command大约需要0.8s ：
- name: Install bower.json for the plugins. sudo: no become_user: www-data command: bower install chdir=/var/www/mortgage-calculator/src/mortgage-plugin-ember-admin
我可以使本地缓冲模块执行得如此快吗？