Defines the initial size of the send queue. Messages are placed in this queue ready to be sent in packets to their destination.
This property determines the initial size of the queue that holds messages before they are combined into packets and sent through the network. Although the size of this queue is increased by Unity Multiplayer if required, it is useful to set up the initial size with a sensible value to avoid this additional runtime memory allocation. The following formula is a good general guideline:
2 * max(topology.SentMessagePoolSize) * hostNumber
Where topology is the HostTopology of the current network and hostNumber is the maximum number of hosts that can be open.