This question already has an answer here:
I have a 105 mbps internet connection , that gives me 96 mbps speed shown on speed test. I get this speed when I connect to a wired ethernet connection , either directly to the modem or through a router . But the problem occurs when I connect wirelessly to the wifi network of the same router. I get only 20mbps. It is linksys e2500 router , that allows simultaneous dual bands . i have tried connecting on 5Ghz network and 2.4ghz , tried all possible combinations , mixed mode , n -only , g-only etc , nothing gives me more than 20 mbps on the wifi network. My laptop does not support 5ghz network but it support the n-standard on the 2.4 ghz. But I do have other devices in the house that support the supposedly empty 5ghz channel . I have tried everything and I never get more than 20mbps on wifi through the same router than gives 95 mbps on wired ethernet.
What can I try ?