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I have a TP-LINK T3U Plus AC1300 USB Adapter. On Windows, it gave me around 180 Mbps download and 170 Mbps upload on 5Ghz.

But on Ubuntu 23.04, the download speed on 5Ghz is only 12-16 Mbps, though the upload speed remains high at 160-170 Mbps. On 2.4Ghz, I get 20-35 Mbps download and 70 Mbps upload.

My internet plan is 200Mbps, so I expect to get close to this speed.

I believe this might be a driver issue. Does anyone know how to fix this?

Update 1: Strangely, when I download models from HuggingFace, I get speeds around 200 mbps (22-25 Mbps downlaod). However, for any other download or when I am on bowser, I consistently get speeds of 17-18 mbps (2-3 Mbps downlaod)

[Edit Sep 19]Few more details :

How do I measure the WiFi speed? I check the upload/download speed using a browser and see the update speed in the Ubuntu console. ALso used Google's default speed test utility from browser

I've also observed that when the computer uses WiFi, the remote desktop connection from my Windows laptop (Both are on the same network) is slow. But when connected with an Ethernet cable, it's smooth.

nmcli d wifi list screenshot, (i am using the second connection) enter image description here

seeker
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2 Answers2

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I have the TP-LINK T3U AC1300 USB Adapter and am using the stock driver that comes with 22.04. lsusb reports this as

TP-Link Archer T3U [Realtek RTL8812BU]

I was connecting with slow speeds and often via 2.4 GHz until I deleted and re-connected to my access point:

Settings ... WiFi ... [my access point SSID] ... Forget Connection

I've been connecting to 5 GHz @ 270 Mbits/s since.

smcnally
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Make sure you are using at least WPA2.
wpa can not use the extended bandwidth due to the way it is encrypted.

wpa_supplicant.conf should read something like below.

network={
    ssid="example wpa2-eap network"
    key_mgmt=WPA-EAP
    proto=WPA2
    pairwise=CCMP
    group=CCMP
    eap=TLS
    ca_cert="/etc/cert/ca.pem"
    private_key="/etc/cert/user.p12"
    private_key_passwd="PKCS#12 passhrase"

}

Luke Attard
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