The SplashScreenDelay configuration has no effect running app on Android device (Pixel 3 XL). The splash screen displays for a second and the app is launched. I have tried adjusting the value with and without the --prod flag without success:
Ionic:
ionic (Ionic CLI) : 4.10.2 (/usr/local/lib/node_modules/ionic)
Ionic Framework : @ionic/angular 4.0.1
@angular-devkit/build-angular : 0.12.4
@angular-devkit/schematics : 7.2.4
@angular/cli : 7.2.4
@ionic/angular-toolkit : 1.3.0
Cordova:
cordova (Cordova CLI) : 8.0.0
Cordova Platforms : android 7.0.0
Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 3.1.2, (and 7 other plugins)
System:
Android SDK Tools : 26.1.1 (/Users/meusercx/Library/Android/sdk)
ios-deploy : 1.9.2
ios-sim : 6.1.2
NodeJS : v9.11.1 (/usr/local/bin/node)
npm : 6.7.0
OS : macOS High Sierra
Xcode : Xcode 10.1 Build version 10B61