1. Apparatus comprising: an interface, which is configured to communicate with a memory device; and a processor, which is configured to send to the memory device, via the interface, a sequence of write commands that program multiple types of memory pages that incur respective different programming durations in the memory device, while inserting in the sequence suspension periods for permitting execution of storage commands that are not part of the sequence, such that at least some of the suspension periods are followed by write commands of types that do not have a shortest programming duration among the programming durations.