The window size (default value 10) represents the maximum number of update messages that can be sent without immediate acknowledgment from the consumer.
It is more efficient to send many messages in quick succession instead of waiting for an acknowledgment after each message. Using the appropriate window size, you can eliminate the time replicas spend waiting for replication updates or acknowledgments to arrive.
If your consumer replica is lagging behind the supplier, increase the window size to a higher value than the default, such as 100, and check replication performance again before making further adjustments. When the replication update rate is high and the time between updates is therefore small, even replicas connected by a local area network (LAN) can benefit from a higher window size.
You can use DSCC to perform this task. For information, see Directory Service Control Center Interface and the DSCC online help.