Wi-Fi adapters are slow

I bought one adapter works, but so that from outside only distinguished by the lack of an inscription no connection in the browser. Some time later I bought the second works better, and even loads the page, but in the same VK to sit is problematic. Decided of grain you use per seat adapter to your tablet(connect them to usb'person and in the settings included the usb modem) and hoba - everything started to work like clockwork. What the hell, gentlemen?