Need more info as Animosity says.
Seeing the contents of your rclone.conf would help too (but if you share this make sure to redact all sensitive information, such as clientID, clientsecret, token and driveID).
Are you transferring a lot of small files, large files or mixed?
If at least some of the files are larger I would recommend using
depending on how much memory you can afford to use. Each transfer (default 4) will be allowed to use this much memory for chunking, so 60x4=240MB for example. This will increase transfer efficiency on any files larger than 10MB (which is the default). Higher chunksize is better, but above 60MB the gains will be small, so don't go overboard with it.
Given how poor your tranfser speed is here, I kind of doubt this is the only problem however - unless you are transferring very many small files (in which case there is little that can be done about it due to server-side limitations). You should (on larger files at least) be able to achieve a little over 2MB/sec or a bit over 17Mbit/sec.