Che just bought a new Dell XPS Desktop and it's started to slow down drastically. He does a speed test, like Leo taught, and the desktop is much slower than his laptop. Leo says to try plugging the desktop directly into the router with an ethernet cable, and see if the speed improves. If so, then he's narrowed it down to the router. Leo says it could the hardware, but he could try reinstalling the Wi-Fi connection. There may also be conflicting Wi-Fi drivers at work between the hardware driver and the Windows driver. That can confuse Windows and slow things down. Another issue is that the computer may be "promiscuous" with trying to join other Wi-Fi signals.