Does WiFi adapter affect Internet speed?

The distance between your wireless adapter and router can affect your internet speed. To obtain a strong signal, move any objects that may be hindering wireless waves. If connections frequently drop or speeds are very slow, consider purchasing a wireless repeater.

Do I need a wireless USB adapter?

A USB WiFi adapter overrides the computers built-in wireless functionality, giving you a faster, more reliable connection to your available network signals through the USB port instead. Plus, the plug-and-play convenience means you can remove the device when its not needed to use in another computer.