Aurora R12, slow USB speeds

The usbs are supposed to be 3.0, but I'm getting very low throughput. (20 MB/s) I know some ports are 2.0 but I've literally tried them all at this point. Dell SupportAssist claims everything is up to date. Tried looking through the bios, but couldn't find much. I did do a clean OS install a few days ago, but idk what I'm missing here?