@TP-Link I don't seem able to reproduce this issue anymore yet I did it 4 times in a row when I was encountering the problem ... and I was *really* careful on the last one. I have a possible...

Wired throughput can plummet if a wired device gets assigned to a Deco that isn't directly connected to the internet. This seems to be a Deco bug with an easy repro. Consider the following...