Ionic 3 - Lazy Loading My application takes too long to show how?

Good evening please I use Ionic 3 - Lazy Loading Pages I always have problems when I compiled with --prod. I have the following errors that show

Microsoft Windows [version 10.0.10240]
(c) 2015 Microsoft Corporation. Tous droits réservés.

C:\Users\LARUMEUR\Desktop\appLastSave>ionic cordova build android --prod
Running app-scripts build: --prod --platform android --target cordova
[21:14:03]  build prod started ...
[21:14:03]  clean started ...
[21:14:03]  clean finished in 297 ms
[21:14:03]  copy started ...
[21:14:05]  deeplinks started ...
[21:14:06]  deeplinks finished in 516 ms
[21:14:06]  ngc started ...
[21:14:31]  ngc finished in 25.56 s
[21:14:31]  preprocess started ...
[21:14:31]  preprocess finished in less than 1 ms
[21:14:31]  webpack started ...
[21:14:34]  copy finished in 30.81 s
Error: ./src/app/main.ts
Module not found: Error: Can't resolve './app.module.ngfactory' in 'C:\Users\LARUMEUR\Desktop\appLastSave\src\app'
resolve './app.module.ngfactory' in 'C:\Users\LARUMEUR\Desktop\appLastSave\src\app'
  using description file: C:\Users\LARUMEUR\Desktop\appLastSave\package.json (relative path: ./src/app)
    Field 'browser' doesn't contain a valid alias configuration
  after using description file: C:\Users\LARUMEUR\Desktop\appLastSave\package.json (relative path: ./src/app)
    using description file: C:\Users\LARUMEUR\Desktop\appLastSave\package.json (relative path: ./src/app/app.module.ngfactory)
      no extension
        Field 'browser' doesn't contain a valid alias configuration
        C:\Users\LARUMEUR\Desktop\appLastSave\src\app\app.module.ngfactory doesn't exist
      .ts
        Field 'browser' doesn't contain a valid alias configuration
        C:\Users\LARUMEUR\Desktop\appLastSave\src\app\app.module.ngfactory.ts doesn't exist
      .js
        Field 'browser' doesn't contain a valid alias configuration
        C:\Users\LARUMEUR\Desktop\appLastSave\src\app\app.module.ngfactory.js doesn't exist
      .json
        Field 'browser' doesn't contain a valid alias configuration
        C:\Users\LARUMEUR\Desktop\appLastSave\src\app\app.module.ngfactory.json doesn't exist
      as directory
        C:\Users\LARUMEUR\Desktop\appLastSave\src\app\app.module.ngfactory doesn't exist
[C:\Users\LARUMEUR\Desktop\appLastSave\src\app\app.module.ngfactory]
[C:\Users\LARUMEUR\Desktop\appLastSave\src\app\app.module.ngfactory.ts]
[C:\Users\LARUMEUR\Desktop\appLastSave\src\app\app.module.ngfactory.js]
[C:\Users\LARUMEUR\Desktop\appLastSave\src\app\app.module.ngfactory.json]
[C:\Users\LARUMEUR\Desktop\appLastSave\src\app\app.module.ngfactory]
 @ ./src/app/main.ts 2:0-60
    at new BuildError (C:\Users\LARUMEUR\Desktop\appLastSave\node_modules\@ionic\app-scripts\dist\util\errors.js:16:28)
    at callback (C:\Users\LARUMEUR\Desktop\appLastSave\node_modules\@ionic\app-scripts\dist\webpack.js:121:28)
    at emitRecords.err (C:\Users\LARUMEUR\Desktop\appLastSave\node_modules\webpack\lib\Compiler.js:269:13)
    at Compiler.emitRecords (C:\Users\LARUMEUR\Desktop\appLastSave\node_modules\webpack\lib\Compiler.js:375:38)
    at emitAssets.err (C:\Users\LARUMEUR\Desktop\appLastSave\node_modules\webpack\lib\Compiler.js:262:10)
    at applyPluginsAsyncSeries1.err (C:\Users\LARUMEUR\Desktop\appLastSave\node_modules\webpack\lib\Compiler.js:368:12)
    at next (C:\Users\LARUMEUR\Desktop\appLastSave\node_modules\tapable\lib\Tapable.js:218:11)
    at Compiler.compiler.plugin (C:\Users\LARUMEUR\Desktop\appLastSave\node_modules\webpack\lib\performance\SizeLimitsPlugin.js:99:4)
    at Compiler.applyPluginsAsyncSeries1 (C:\Users\LARUMEUR\Desktop\appLastSave\node_modules\tapable\lib\Tapable.js:222:13)
    at Compiler.afterEmit (C:\Users\LARUMEUR\Desktop\appLastSave\node_modules\webpack\lib\Compiler.js:365:9)

OP DUPLICATE My application takes too long to show how?