A new option for data transfers is available from version 4.3.0 and later: mbuffer transport cam be set for "Storage System Link" type.
You can enable this by unchecking Encryption in the system link properties.
This type of transport is useful for when more bandwidth is required for replication jobs.
SSH is the default transport method and can significantly slow performance because it encrypts all traffic.
Lease review the link below for additional detail: