Windows上的ember-cli构建太慢

我刚刚开始玩Ember和ember-cli。我创建了一个模板项目，并从Web Starter Kit中添加了很少的js行和一些sass文件。而且我的项目增量构建时间几乎是15到25秒。我正在运行Windows 8.1，SSD，i5和12 GB RAM。

C:\Users\MyUser\Projects\ember\webapp>ember --version
version: 0.1.4
Could not find watchman, falling back to NodeWatcher for file system events
node: 0.10.29
npm: 2.1.10

项目来源：https：//github.com/mmrath/ember-webapp

我尝试从索引，Windows Defender排除项目目录，并从Windows Defender排除节点。到目前为止没有任何工作。

如何减少构建时间？

更新：以管理员身份运行命令提示符后

C:\Users\MyUser\ember\webapp>ember serve
version: 0.1.4
Could not find watchman, falling back to NodeWatcher for file system events
Livereload server on port 35729
Serving on http://0.0.0.0:4200/

Build successful - 5632ms.

Slowest Trees                  | Total
-------------------------------+----------------
SassCompiler                   | 713ms
EsnextFilter                   | 622ms
ES6Concatenator                | 530ms
EsnextFilter                   | 413ms
Funnel                         | 374ms
TreeMerger (vendor)            | 343ms
TreeMerger (appAndDependencies) | 321ms

file added styles\wsk\components\_components\_sidebar-menu.scss

Build successful - 7171ms.

Slowest Trees                  | Total
-------------------------------+----------------
TreeMerger (vendor)            | 879ms
SassCompiler                   | 745ms
Funnel                         | 667ms
TreeMerger (appAndDependencies) | 467ms

file changed styles\wsk\components\components.scss
file changed styles\app.scss
file changed styles\wsk\components\_components\_sidebar-menu.scss

Build successful - 5707ms.

Slowest Trees                  | Total
-------------------------------+----------------
Funnel                         | 1119ms
TreeMerger (vendor)            | 656ms
SassCompiler                   | 586ms
TreeMerger (appAndDependencies) | 389ms

提前致谢。