After splash screen - ionic4

ionic 4:
My app, currently about 4 lazy modules. 3 Providers are declared in the app.module.ts

After the splash screen, the screen is white for 1-2 seconds and then the 1st screen displays.

How can I eliminate the 2 sec whiteness after the splash?

Eng team,
Accounting/Inventory/Field Service on Google Cloud and Mobile.