I have 1GB fiber coming into my home.  I have 3 TP-Link Deco P9 units deployed, one of which has a wired Ethernet connection to the modem and the others of which do not.

The wired unit is on second floor, and the two non-wired units are on the first floor.

If I go up to the second floor and stand in front of the wired P9, I get WiFi speeds up to 450Mbps down.  If I go downstairs and stand in front of *one* of the non-wired P9s, I get speeds around 210 Mbps.  If I stand in front of the other non-wired P9, I get WiFi speeds around 60 Mbps.

I don't understand the variation in the two non-wired units.  Why is there such a disparity in speeds I'm seeing between them?

UPDATE:  I tried an experiment:  I *unplugged* the non-wired unit that I was getting 210 Mbps near and tested speeds in the two non-wired locations again.  Standing in front of the now-unplugged unit, WiFi speeds went *up* to the low 400's!  So, clearly, the unit in that room is doing little but getting in the way?  The speeds near the other non-wired unit did not appear to change from the unplugging.  I tried unplugging the other non-wired unit (so both unplugged), and WiFi speeds near the second non-wired unit (that had 60 Mbps speeds before) went down to 20 Mbps.

So, can I not expect better than 60-80 Mbps from the non-wired P9?

Thanks,

Eric