here's my forums thead on this matter:
The more i crank down on the bandwidth(i need to get it down to 10 megabits/sec) then rclone uses less and less cpu and takes oonger and longer to start(if it does at all which it never does anything below 10MB). the mahcines maximum wan connection is 2.9 MiB/s. Even if i go as low as 5 the uploads either never start or are so slow they are estimated to take 4 months. I am attempting to upload about 1.6TB to backblaze b2.