When it comes to the latency of processing a request in a distributed system, everyone knows (or should know) that doing things over the network is the most expensive thing you can do (alongside with disk reads): The round trip time in a datacenter is about 5000 times longer than a main memory reference Modern architectures have recognized this and will favor keeping data in memory, avoiding the need to go to disk or to the database, when consistency requirements allow for it. With Akka Cluster Sharding combined with Akka Persistence, it is possible to keep millions of durable entities in memory, reducing latency to a large degree.
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