I just bought the archer t4u ac1300 v3. With the latest software I'm getting around 110-117 mbps, but with an ethernet cable I get 130-140 mbps. For the testing I have my pc very close to the router but I want to move it into a different room. Is the ~15 mpbs difference normal or is there something I have to change. For the testing I have it in the front usb (3.0) port, when I change it to the rear usb (3.0) port I get around ~100 mbps.

I'm using 2.4 GHz network