A6150 wifi adapter really slow

Hello,

I just bought a wifi adapter for my desktop computer and I find it really slow. Basically my internet connection is cut by 20. I have a 60Mbps speed, as speed test said on a phone and wired, but the same speedtest on my desktop computer with the adapter reaches 3Mbps maximum.

I have the lastest driver, is that normal please ?
(I’m at the same floor than the router and there is just a wall between me and the router)

Thank you