Too slow ember-cli build on windows

I have just started to play with Ember and ember-cli. I created a template project and added very few lines of js and some sass files from Web Starter Kit. And my project incremental build times are almost 15 to 25 seconds. I am running Windows 8.1, SSD , i5 with 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

Project source: http://ift.tt/1AwT9Ay

I have tried excluding the project directory from indexing, windows defender and excluding node from windows defender. Nothing worked so far.

How can I bring down the build time? Thanks in advance.