I have created an Ionic2 app for android mobiles. To implement multiple functionalities I have used various plugins available to serve my requests. My app(production build) takes 13-15 seconds of initial loading time. Is this loading time natural for Ionic2 Apps having plugins?
Yes in general they increase it a little but not that much (10+ sec). The problem you encounter probably is that your application runs in development mode.
To build it in production mode use the --prod command line flag. (You should see the line ngc started... in the console.)
On the one hand this will decrease the bundle size & increase the performance of your app a lot, on the other hand it will become harder to debug your applications in the browser, as now it's compiled.