Why emberjs starts too slow at Cordova project?

I have simple emberjs application created with ember-cli with commnad ember new MyApp, this application has only one template

<h2 id="title">Welcome to Ember</h2>
{{outlet}}

I'm using this app with cordova at android platform. When application starts, it takes 5-6 seconds before "Welcome to Ember" text appears. Why it is so slow? Is there any configurations I have to do for cordova project?