When I connect my computer to the internet cable, internet is working at high speeds. However, when I connect it to a router through the wireless adapter, the internet connection becomes really slow (minutes for a page to load). Other computers connected to the same router do not show this problem. If I connect my computer to other routers, same problem appears. Can somebody suggest any solutions?
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Computer can be too far from the access points, with obstructions. See if there are new drivers for your wireless network card also, install them.