ionic pro live deploy: slow launching time except when initial launch from playstore/appstore

I built an app using ionic and used ionic pro live deploy with UPDATE_METHOD="none". Everything works fine: checking, downloading, extracting, and redirecting seems fine.

However, I observed that whenever I launch the app with updated version (version from ionic dashboard), the app starts very slow. Unlike when it was initially launched.

Initial launch (fresh from Playstore) takes 4s-5s. Launch after checking and downloading version in ionic dashboard takes >20s.

The apk/ipa file was built using the source pushed in git.

Here is the ionic info

@ionic/cli-utils : 1.19.2 ionic (Ionic CLI) : 3.20.0

global packages:

cordova (Cordova CLI) : 8.0.0

local packages:

@ionic/app-scripts : 3.1.8
Cordova Platforms  : android 6.4.0 browser 5.0.1 ios 4.5.4
Ionic Framework    : ionic-angular 3.2.1


ios-deploy : 1.9.2
Node       : v8.9.1
npm        : 5.8.0
OS         : macOS Sierra
Xcode      : Xcode 9.1 Build version 9B55

Environment Variables:

ANDROID_HOME : not set


backend : pro

EDIT: The uploaded apk was built using ionic cordova build android --prod --release