Firestore call takes 10 times more time on Android than iOS

[CiprianGabor]

I have this simple function on my KMM repo:

suspend fun getUserProfile(): UserInfo?
{
    val start = Clock.System.now()
    val result =  firestore.collection("User").document(auth.currentUser!!.uid).snapshots
        .mapLatest { user ->
            user.data<UserInfo>()
        }
        .firstOrNull()
    val end = Clock.System.now()
    println("time: ${(end-start).inWholeMilliseconds}")
    return result
}

Do you have any insights into why it takes about 2000ms on Android and around 200ms on iOS? The Android call is about 10 times slower, which is impacting the UI. Keep in mind that is a Kotlin Multiplatform repo, so it runs the same function for both phones.

Thanks for the help.

[Reedyuk]

It could be related to how coroutines/dispatchers work different between ios and android. You might find that your ios implementation is running on a dispatch queue on the main thread, whereas on android it runs on a io coroutine.