Option to specify the send spinning timeout (in microseconds) of the Send(Message) method to wait for the socket sending buffer availability in the spin loop mode before placing the message to the outgoing queue (to be sent later by the sending thread). The value should not be greater than 1 sec (minimal Heartbeat interval). By default, the option value is zero, therefore the value of the SendSpinningTimeout is used.

public virtual int SendSpinningTimeoutUsec { get; set; }