Slow wireless, fast ethernet

[mclad]

The wireless on my mbp is really slow most of the times -- about 3Mbps. I get 13 Mbps via ethernet. (speedtest.net)
A windows machine connected to the same network gets 13 Mbps on wireless as well as ethernet. Even my iphone gets 12 Mbps.
I guess this rules out problems with the router (DLink DI-524 with WEP).
Tried OpenDNS servers, no change. Also tried disabling file/internet sharing, Ipv6.

Any pointers are appreciated!

 

[Tomb85]

I had this with a netgear router. Weird thing is wireless on a windows laptop was fast. MacBook & iPhone were incredibly slow. MacBook was fine on ethernet.

Only thing I came up with was to buy an airport express. Solved it all. Bit pricey I know, but it just saved so much hassle. Get better range now too...