I use this tool extensively and it's awesome: http://sprightlysoft.com/s3sync/ http://sprightlysoft.com/s3sync/ It has the same name. Check out -TransferThreads

I use this tool extensively and it's awesome: http://sprightlysoft.com/s3sync/ http://sprightlysoft.com/s3sync/ It has the same name. Check out -TransferThreads parameter for paralel uploads/downloads (see Documentation link). I use it for syncing dozens of buckets each containing tens of thousands of small files and it works without a glitch.