Before my question, thank you very very much to to the rclone team !
This tool is really near the perfection.
So here the point, I use rclone with box and it work perfectly I don't encounter any error but I use a low volume of data.
I know box have an upload limit of 240 uploads/minutes.
I mount rclone box with this options :
rclone mount --config=./rclone.conf --vfs-cache-mode full --vfs-cache-max-age 96h0m0s --vfs-cache-max-size 3000M --cache-dir ./cache box:/ /media/box
The question is : Does RCLONE upload file one by one or does upload it per batch ?
To speak with number it gives :
I create instantaneously 1000 files of 3MB so it fit in my cache directory, but what happen with BOX ? Rclone upload 1000 files directly or 1 request wich contain 1000 files ?
Thank you everybody for your help and sorry for bad english, it is not my first language.