Ionic app takes 16 seconds to start

Can you be more specific and give us more data that why DIV or Input should not be used. As Ionic components will eventually turn into these html tags. Even thought ion-content will be rendered as nothing but div.

Ionic cli info
cli packages: (C:\Users\AppData\Roaming\npm\node_modules)

@ionic/cli-utils : 1.19.0
ionic (Ionic CLI) : 3.19.0
global packages:

cordova (Cordova CLI) : 7.1.0
local packages:

@ionic/app-scripts : 3.1.5
Cordova Platforms : android 6.3.0
Ionic Framework : ionic-angular 3.9.2
System:

Android SDK Tools : 26.1.1
Node : v6.11.3
npm : 3.10.10
OS : Windows 10
Environment Variables:

ANDROID_HOME : C:\Users\AppData\Local\Android\sdk
Misc:

backend : pro

tried all possible ways and still getting this problem ?
please help