Low link speed with Asus AC56 stick

[buddy123]

Hi everyone,
After upgrading my router to a Linksys WRT1900ACSv2, I decided to give a little upgrade to my older laptops in my home, that one of them is a macbook air 2012.
I bought the asus ac56 stick, downloaded latest firmware from Asus website and plugged the stick to my laptop. Both USB's are USB3.0.
I get a link speed of 144Mb/s, where my other newer laptop, that comes with AC card built-in, gets a decent 866Mb/s
In Settings->Network, the card is identified as 802.11n NIC
Why cant I get a normal AC speed?

 

[pete y testing]

I get a link speed of 144Mb/s,

sounds like you are connecting to the 2.4 gig and not the 5 gig

In Settings->Network, the card is identified as 802.11n NIC

where did you install the drives from ?

https://www.asus.com/Networking/USBAC56/HelpDesk_Download/

go to the link above and download the mac os drives and install the latest one

 

[sfx2000]

I get a link speed of 144Mb/s, where my other newer laptop, that comes with AC card built-in, gets a decent 866Mb/s
In Settings->Network, the card is identified as 802.11n NIC

Your airport card is still active in the MacBook...

The Asus is controlled by the realtek driver util - but you need to remove the association on the Airport card first - and then turn it off.

 

[buddy123]

Your airport card is still active in the MacBook...

The Asus is controlled by the realtek driver util - but you need to remove the association on the Airport card first - and then turn it off.

If I turn off the built-in wifi, it still happen. Is this not enough?
What are the correct steps to remove it then? Settings -> Network and just removing the wifi card, leaving only the Asus one there?

sounds like you are connecting to the 2.4 gig and not the 5 gig

where did you install the drives from ?

https://www.asus.com/Networking/USBAC56/HelpDesk_Download/

go to the link above and download the mac os drives and install the latest one

I know, it does sounds like that. The latest drivers are what I installed from the link mentioned

 

[buddy123]

Update: I completely removed the builtin wifi card and any other interface, leaving only the asus one.
Also tried to re-install it with the latest firmware from their website, and link speed is always 144Mbps
What else can I check ?

 

[sfx2000]

Check their release notes - saw something about mis-reporting the link speeds