The scripting reference describes that the message pool size for Networking will increase by Networking.HostTopology.MessagePoolSizeGrowthFactor if it is too small. This is not the case. If game configures the ConnectionConfig.MaxSentMessageQueueSize to be larger than the default value, as then the pool size will be smaller than the message queue size, and then slower clients could be overwhelmed and reliable traffic will be resent over and over until disconnection.