KN-1910 slow 5 GHz WiFi (~80 Mbps)

[strange_v]

I have two laptops that connected to KN-1910 WiFi:

# Laptop 1
Protocol:    Wi-Fi 5 (802.11ac)
Security type:    WPA2-Personal
Network band:    5 GHz
Network channel:    52
Link speed (Receive/Transmit):    866/866 (Mbps)
Manufacturer:    Intel Corporation
Description:    Intel(R) Wi-Fi 6 AX201 160MHz #2
Driver version:    22.170.0.3

# Laptop 2
Protocol:    Wi-Fi 5 (802.11ac)
Security type:    WPA2-Personal
Network band:    5 GHz
Network channel:    52
Link speed (Receive/Transmit):    390/390 (Mbps)
Manufacturer:    Intel Corporation
Description:    Intel(R) Dual Band Wireless-AC 3165
Driver version:    19.51.42.2

Both show the same speed when copying a big file from NAS: ~80 Mbps. It was definitely faster before though I do not remember the exact numbers. The laptops and the router are in the same room.

 

What I've already tried:

• Update to the latest version (from 3.8.x to 3.9.2)
• Change WiFi channel
• Change WiFi region

 

The same laptop connected via Ethernet shows ~900 Mbps.

What could be the reason?

[strange_v]

The issue was not in the WiFi, but in the cable that connects the router with a switch. So basically, the router was connected to the local network via 100 Mbps link.

Now WiFi speed is ~450 Mbps.

Edited January 17 by strange_v
wording