Thanks. I've tried playing around with the upload limit, but didn't seem to make much difference. My speeds never seem to exceed about 10% of the theoretical limit so setting the upload limit to 300MB/s didn't change anything. I almost never get more than 1MB upload speeds.
Honestly, I can live with the slow speeds. My real concern is why the docker is bogging down my server so badly. IDK, maybe the two problems are related?