Unable to render larger html file

We have a performance issue when we are rendering larger html files. We need to render 4 different pages. Each page has 4000 lines of code.
We tried to use preloadModules but unable to show html. application crashes on Android devices, but unable prioritize all four pages
We are using lazy loading in our ionic 3 application.
application specification as follows:
Ionic CLI: 5.1.0 (C:\Users\test\AppData\Roaming\npm\node_modules\ionic)
Ionic Framework: ionic-angular 3.9.5 @ionic/app-scripts: 3.2.2
Cordova CLI: 6.5.0
Cordova Platforms: not available