Increase the amount of CPU cores and RAM on your VPS. I had 8 or 9 cores and 32GB RAM.
***** WARNING! So Amazon locked my account and don't want to unlock it.... Warning to all
What region? did you use?
I have an Amazon UK account so chose Western Europe.
EU region and i did it with 1 core 4Gb ram, - speed 220-250MB rclone copy acdUK acdDE
I’m doing acd germany to drive so I picked us east, perhaps I should go with west eu?
Not sure how much it would matter, give it a try.