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Are you sure the wi-fi is meant to be gigabit and that's not referring to the ethernet ports. Gigabit speed wi-fi seems optimistic.
One issue I found was lots of laptops defaulted to 2.4GHz connection which was considerably slower.
aggi-
The theory, on paper at least, is that a wifi card will negotiate the fastest link speed possible based on signal quality. If its a dual band wifi card, it'll choose 2.4g if it thinks it'll be faster than 5, particularly on dual band mesh systems.
Have you looked at Signal to Noise ratio to get a feel for whether something is interfering? All kinds of things can throw wifi off. Ours shifts down link speed every time our neighbour plugs his Tesla in.
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Anecdotally, I should be hitting 350+ on the Ubiquiti APs.
Certainly not the <50 I have now.
Even 2.4GHz on 20MHz width should get better than that.
Signal strength / noise doesn't appear bad - -20Db and -95Db
Stonehedge
NotThamesWater
It looks as though we're having similar problems.
I get 950Mbps over ethernet LAN / VLAN, across various switches.
As soon as I connect over wi-fi, though, which is supposed to be Gigabit, my speeds drop to 30Mbps.
I'm buggered if I know why.
It's not signal attenuation, as I am in arm's reach of the AP.