hi,
i have never tried these two flags together, not sure of the behavior?
--checkers --no-check-dest
tho we can see from the log that File not found at Destination
did you try these flags?
--size-only
--s3-disable-checksum
maybe this will spark an idea?
https://forum.rclone.org/t/almost-24-hours-cpu-compute-time-during-sync-between-two-large-s3-buckets/39375