A question I get a lot concerns USB WiFi adapters. People want to know how they can tell if a WiFi adapter will help speed up their PC. First, check the speed of the Internet connection that your computer is receiving compared to the speed of the connection that you’re paying for. You can use a site like Speed Test. If you aren’t sure what the maximum speed of your Internet plan is, you can check with your ISP.
If you’re getting the full speed that you’re paying for, there’s nothing an adapter can do for you unless it also has an antenna. That might allow you to pick up the signal from a greater distance within or nearby your home. An adapter can’t make the signal faster than what’s coming into the home.
If you aren’t getting the full speed, you need to choose an adapter that offers a higher speed that your computer is already capable of receiving. I hope that explanation clears it up a little.