@elizarov Hi Roman, I have an easy question for you regarding https://github.com/Kotlin/kotlinx.coroutines/blob/master/coroutines-guide.md#thread-confinement-coarse-grained: Why is the coarse-grained confinement strategy so much better than fine-grained here? is this because no switching between coroutine contexts is necessary? Also, I'm wondering whether coroutines executed in a single thread give any benefit in terms of parallelism? is this any different from a sequential computation in a loop? In this example the overload introduced is too expensive I think