Yes, but I have 1 gbit uplink and upload speads are 3 megabytes per second at best. Actually, I tried via rclone from VPSs at various locations also and no change. Frankly, that's shit. I've been paying the 2€/month 100GB storage plan simply because the OneDrive Android app does its job of offloading photos quickly well but that's really it's good for. That, and uploading 100K-1M Office documents.

As soon as I noticed this issue, the deal of 1TB storage with a O365 subscription also went sour. 1TB I can't really use -- no deal.

This problem is well known; it's all over the internet -- OneDrive is a sloth. It doesn't affect downloads, btw.