<Map() processed all items and can be very slow> I...

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Map() processed all items and can be very slow
I am working with huge lists and have some performance problems:
I narrowed it down to the following code:
var counter1 = 0
var counter2 = 0
val list = ArrayList(100)
for (i in 0 until 100) list.add(Point(i, 0))

list.map {
it.x
++counter1
}.subList(0, 5).forEach {
++counter2
}
Log.i("XXXXXXXXXXXXX", "counter1 == $counter1, counter2 == $counter2")

I expected the output to be:
I/XXXXXXXXXXXXX: counter1 == 5 counter2 == 5
But it actually...