Archer (AX90) AX6600 Tri-Band Wi-Fi 6 Router slows to half ISP speed
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I have Comcast as my ISP with 1GB service
MODEM:
Arris Surfboard DOCSIS 3.1
ROUTER
Model: Archer (AX90) AX6600 Tri-Band Wi-Fi 6
Hardware Version: Archer AX90 v1.0/v1.20
Firmware: 1.0.6 Build 20201020 rel.75204(5553)
Smart mode off
Tri-band enabled
Channels set to Auto
CLIENT
Model: 2020 MacBookAir M1 with MacOS BigSur and a 802.11ax WiFi card.
Anti-virus: turned off
PROBLEM
AX wifi download speeds dropped drastically when measured using speedtest.net with speed dropping on other bands as well.
870 Mbps down - Cat7 plugged directly to modem
720 Mbps down - Cat7 plugged directly to router port (via Cat7 to UBC-3 adaptor)
450 Mbps - 5GHz-2 (ax only) - client speed next to router
200 Mbps - 5GHz-2 (ax only) - client speed 25-feet away in next room
Upload speeds same across tri-bands at 38 Mbps to 40 Mbps.
I WANT TO SOLVE the 5GHz-2 (ax only) download speed issue. The Archer (AX90) AX6600 Tri-Band Wi-Fi 6 is NOT performing as advertised.