@GuzmanM 

Hi,

A good rule of thumb is that the practically achievable real-world speed of Wi-Fi cards/adapters (of any brand) is roughly half of the "advertised" speed number when the Wi-Fi router and the Wi-Fi adapter are located within the same room. As the distance between the two increases, the throughput speed decreases further.

Also, in case your are using a desktop-type of computer, then avoid plugging the USB Wi-Fi adapter into a USB port on the back panel of the computer where all the cables are connected, because this is usually the worst place for transmission and reception of radio signals.