Restore is typically about half the backup speed -- this is because the
receiving client must re-insert filesystem entries for the restored data.
Database (SAP) files are large, os-level backups are usually small files, so
there's alot more file system open/close/dir-create activity, which is what
slows down the restore.

Similar performance reductions with backups were a major issue -- mostly
fixed by file-aggregation introduced in v3, further enhanced in v3.7.