Rclone copy dry-run of big S3 bucket is taking super long time to start

[kapitainsky]

And similar issue you maybe find something useful there:

Long delay when copying millions of tiny objects

Hi all, I am seeing a long idle time between submitting the copy command and start of the actual transfer. Source and Target are two different S3-compatible Cloud Object Storages. There are millions of tiny (few KB) keys with the specified source prefix. The destination bucket also contains millions of objects, but none share the prefix that I am trying to copy. Delay before rclone uploads files, a newbie question looks similar, but my objects are tiny and calculation for the downloaded keys s…