The payload is a Map. Refreshes for this Map may be in multiple response messages. The bandwidth of the refresh messages can be optimized by putting multiple MapEntry in each response messages. For optimal performance the packed map entries in each response message should use less than 6000 bytes. If the data is split into multiple response messages, then a Map.TotalCountHint should be provided to optimize downstream caching. Because the fields in each MapEntry are the same, bandwidth can be further optimized by DataDefinitions.