NextCloudPi throughput

I’ve been running ncp at home for some time now, and it’s been working fine, but I recently upgraded the hardware from a RPi 3 to a 4, and was doing various testing to make sure everything is working. From a functional standpoint; everything works great, but I noticed that the upload throughput of both devices is strangely low.

When running speediest-cli (which has given me reliable results in other situations) on the ncp, both the RPi 3 and 4 are only able to achieve 3.2 Mbit/s for upload. My internet connection is delivering 11 Mbit/s upload, and I can get that throughput on other devices (including another RPi on the same network).

Before I get too deep into troubleshooting this, I thought I’d ask if there is any known reason why the upload bandwidth would be throttled. Any thoughts?