I am trying to use rclone to upload millions of small files to a storage provider. Using the default settings (--transfers 4) works fine, but it's a waste of the server bandwidth.
Each file is approx 1-2KB. My bandwidth is ~50MBps.
I tried using --transfers 1000, which got me the following error from the provider:

Their support suggested making persistent connections, but I could not find such an option in rclone.
I looked at the tpslimit option (setting it to 1.6), but that would effectively cap me
at max 100 files per minute. I want to cap my connections, not the files transferred.
Is this something I can accomplish either with an rclone option or with a system tweak?