How to not always compile all assets on autoload in ember.js

I've started my first ember.js project with ember-cli including ember-cli-broccoli-compass to compile my stylesheets with compass. Now that I've done my first styling, my stylesheets need 5 seconds to compile. When I now work on my javascripts and there are any changes to my files, my whole project, including the stylesheets, is re-compiled, which lasts a bit too long for me. So, is there any way to exclude the stylesheets from the compiling process?