Speed and verification of GDrive to B2 server side copy

What is the problem you are having with rclone?

I'm attempting do a server-side copy from my personal Google Drive account to Backblaze B2. However, it is very slow, around than 2Mb/s (which incidentally is the upload bandwidth limit for my local internet connection).

Here's a typical log message that I'm getting the transfer speed from:

2020/05/17 20:11:42 INFO  : 
Transferred:   	  175.666M / 10.526 GBytes, 2%, 244.194 kBytes/s, ETA 12h21m
Errors:                 1 (retrying may help)
Checks:               380 / 380, 100%
Transferred:           75 / 7999, 1%
Elapsed time:     12m16.6s
Transferring:
 * 170210378-Thomas-J-R-H…Prentice-Hall-1987.pdf: 56% /141.083M, 117.911k/s, 8m50s
 * Music/Cowboy Bebop/Cow…OY BEBOP -  Tank!.flac: 80% /23.656M, 44.419k/s, 1m47s
 * RaceCar Vehicle Dynami…& Dougls Milliken .pdf: 63% /83.127M, 43.645k/s, 11m46s

So my problem/question is two-fold (as I see it):
A) Is there a way to verify that rclone is running server-side copies instead of downloading and uploading files?
B) If I am actually running server-side copy, is there a way to speed up server-side transfers? Most other similar topics on the forum are about local-to-remote transfers and I feel like the optimal settings would be significantly different between then.

The command I'm running right now is:

rclone copy -vv --fast-list gdrive_personal: b2_init2:/InitialGDriveBackup --drive-chunk-size 32M --tpslimit 3 --transfers 3 --drive-server-side-across-configs

where gdrive_personal is my Google Drive and b2_init2:/InitialGDriveBackup is my Backblaze B2 bucket.

What is your rclone version (output from rclone version)

➜ rclone --version
rclone v1.51.0
- os/arch: linux/amd64
- go version: go1.14.2

Which OS you are using and how many bits (eg Windows 7, 64 bit)

Manjaro 20.0.1, 64-bit

A log from the command with the -vv flag

2020/05/17 20:11:42 INFO  : 
Transferred:   	  175.666M / 10.526 GBytes, 2%, 244.194 kBytes/s, ETA 12h21m
Errors:                 1 (retrying may help)
Checks:               380 / 380, 100%
Transferred:           75 / 7999, 1%
Elapsed time:     12m16.6s
Transferring:
 * 170210378-Thomas-J-R-H…Prentice-Hall-1987.pdf: 56% /141.083M, 117.911k/s, 8m50s
 * Music/Cowboy Bebop/Cow…OY BEBOP -  Tank!.flac: 80% /23.656M, 44.419k/s, 1m47s
 * RaceCar Vehicle Dynami…& Dougls Milliken .pdf: 63% /83.127M, 43.645k/s, 11m46s

Edit: I also forgot to mention that I am using my own Client ID, not the rclone one.

You can't run server side copies across different providers. That copy is piping through your local server.

You can only run server side copies from the same provider like drive to drive.