good, that should be easy to do with 1GB.
if you have lots of small files, gdrive has lots of limits and throttling, that would be a slow pain.
i am not a gdrive expert, but given you can only upload 750GB per 24 hour period, optimizing the command seems pointless.
if you upload at full speed, rclone would hit that limit quickly and error out.
you might want to use --bwlimit=8.5M, i think that is the correct value, you can search the forum.
so i would use the a very simple rclone command, use defaults.
rclone copy source dest --bwlimit=8.5M
and you might want to use a log file