Android Splash Screen API Slow on some devices

Question

I've implemented the new Android Splash Screen API with a RoutingActivity since it isn't feasible for my app to break it down to a single activity application. The recommended way, as per the developer docs is as below:

class RoutingActivity : Activity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        val splashScreen = installSplashScreen()
        super.onCreate(savedInstanceState)

        // Keep the splash screen visible for this Activity
        splashScreen.setKeepOnScreenCondition { true }
        startSomeNextActivity()
        finish()
     }

This seems to work well on some devices but with others, it stays on for over 8-12secs sometimes. I added a log with a timer after on create just to see when execution occurs. It was reached after 5secs.

Is there something that can be done to make the splash screen complete much faster?