Volume Move appears stalled with very low throughput

• ONTAP 9
• Volume Move

• After some time a volume move of a large volume with a high rate of data change appears have throughput drop to < 2 MBs (as seen in volume move show)
• The Move State is "healthy"
• The Bytes Sent value continues to increase
• The Percentage Completed may regress if additional data is changed or written at the source
• There have been no Cutovers Attempted or Times Cutover Hard/Soft Deferred
• Example: volume move show command output shows kB/s throughput and a high estimated finish time (some lines removed for brevity)

Cluster::> volume move show -volume vol1 -vserver svm1

                           Vserver Name: svm1
                            Volume Name: vol1
                 Actual Completion Time: -
                        Bytes Remaining: 4.50TB
                             Bytes Sent: 29.19TB
                     Cutovers Attempted: 0
            Times Cutover Hard Deferred: 0
            Times Cutover Soft Deferred: 0
                  Destination Aggregate: node1-aggr1
     Detailed Status: Transferring data: 29.19TB sent.
           Estimated Time of Completion: Fri Apr 04 12:38:31 2025
                                 Job ID: 4583
                          Managing Node: node1
                    Percentage Complete: 85%
                             Move Phase: replicating
           Estimated Remaining Duration: 33 days 22:56
                 Replication Throughput: 404.4KB/s
                       Duration of Move: 18:54:17
                       Source Aggregate: node2-aggr1
                     Start Time of Move: Fri Feb 28 17:47:55 2025
                             Move State: healthy