iPad 4 Wifi connection is very sloooooow

I just purchased my new iPad4 yesterday but when i connected to my home internet, the speed is just so embarassing. It is very slow. I tried connecting my 2 laptops and desktop pc and the wifi connection seems nothing wrong and the speed is fast like in an ordinary day. I tried to rsolve this issue using the support guide laid out in the website but to no avail i can fix it.

Pls pls pls help me!