Extremly slow (and decreasing) upload speeds

I have just setup duplicati with tardigrade and made a new backup, initially my upload speed was 1.2 MB/s, and over the course of an hour it dropped to 300 KB/s and is still dropping at time of writing. I followed this guide to set it up: Backup With Duplicati - Tardigrade i am on version 2.0.5.111_canary_2020-09-26 (fresh install)