never an issue in 6+ years. i have several storgeboxes.
in one case, i run a cheap vm in the same datacenter as the storagebox.
on the vm, i run jellyin which mounts the rclone encrypted media files on the storagebox.
i connect to the vm/jellyfin over tailscale
i have another vm+storagebox as a veeam backup and replication repository.
if all you want is modtime, then webdav is fastest.
but if you also want file transfer verification using checksum, must use sftp with port = 23
tho storagebox offers smb/samba, that is not safe to use over open internet.
it offers modtimes and in some cases, file transfer verification using checksum
check out my howto guide How to access SMB/SAMBA with rclone