hello and welcome to the forum,
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--drive-chunk-size=1024M, that is for gdrive, so can remove that. -
from the rclone log snippet, rclone is working fine.
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might increase
--transfersand/or--checkers -
have you tested without mount, without NFS?
rclone copy /mnt/archives/synology/shadow_full.hbk transfer1: -vv -
have you tested without rclone?
on the source machine, create a smb mount and usecp? -
950 Mbps- what kind of test did you run to get that value? -
https://forum.rclone.org/t/smb-cifs-slower-than-regular-fstab-mounts/34537/1