MESSAGE_QUEUE_SIZE

This variable sets the initial size of the message queue, in bytes. The message queue is dynamically resized, as needed, to hold large messages. However, it is not resized to hold multiple messages (instead, the sending threads wait until the queue empties). Setting the value larger than the default will allow more messages to be queued. Setting it to a smaller value will allow fewer messages to be queued and conserves memory. The default size is 1024.