[MaterialDatePicker + MaterialTimePicker] (Maybe others as well) slow load time

Description:

I want to use those components in my app but I notice some really unusual loading speed for the initial load after the app is cold started. It takes up to three seconds for the pickers to show up after they are requested.

That behaviour happens when I start the application from Android Studio on my phone or in the emulator. When I use the Sample App for the Material Components from the PlayStore it's behaving normally (so no opening delay). I'm actually kinda clueless what the reasoning might be.

Consecutive clicks are faster.

Expected behavior:

The Pickers should show up nearly instantaneously.

Source code:

This screencapture is from a minimal application that consists just of one Activity:

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        findViewById<Button>(R.id.datePicker).setOnClickListener {
            MaterialDatePicker.Builder.datePicker().build().show(supportFragmentManager, "DATE_PICKER")
        }

        findViewById<Button>(R.id.timePicker).setOnClickListener {
            MaterialTimePicker.Builder().build().show(supportFragmentManager, "DATE_PICKER")
        }
    }
}

The layout just contains the two buttons:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/datePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Open Date Picker"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.33" />

    <Button
        android:id="@+id/timePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Open Time Picker"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/datePicker" />

</androidx.constraintlayout.widget.ConstraintLayout>

Android API version: 10

Material Library version: 1.3.0-alpha04

Device: OnePlus 6T & Emulator in Android Studio

Start with the MainActivity example and reproduce the first-open delay for MaterialDatePicker and MaterialTimePicker on the listed device or emulator, using Material Library 1.3.0-alpha04 and Android API 10. Compare the cold-start and consecutive-click behavior, then identify the loading path responsible; done means both pickers open nearly instantaneously on the first request.