odrive will automatically check from remote changes. The interval and efficiency of these checks depends on the type of storage that is linked.
The popular cloud storage services, like Google Drive and Amazon Drive, have APIs available that will give us the changes since we last asked. This speeds up the process significantly and we can use a fairly short interval for requesting changes. Other sources, like SFTP or FTP, do not have this type of feature, so the remote location needs to be periodically scanned in its entirety. Since a full scan can be very heavy, it uses a longer interval. There isn't a way to speed make the process lighter if the remote storage source doesn't support change requests.