GoKawiilUSB wireless dongles found to degrade Wi-Fi by crowding 2.4GHz band
Many wireless peripherals, such as USB dongles for mice and keyboards, operate on the 2.4GHz radio frequency, a congested band also used by microwave ovens and older Wi-Fi gear. This overcrowding can interfere with Wi-Fi signals and slow down networks, especially for routers that are not running exclusively on the less crowded 5GHz or 6GHz bands used by Wi-Fi 6E and 7.