However with a 92Mbps internet connection this is still way slower than I should be able to achieve.
The router is a DI-524 so should be capable of much better
The DI-524 is 80211.g, so theoretically 54Mb.
However you have to remember these cheap routers are largely performing software based routing, therefore are not likely to be very efficient as bandwidth speeds increase. So I would say trying a new router isn't such a bad idea, but make sure it's one with a reasonable processor.
Have you tried a tool such as iperf to run wireless tests locally between two machines ? Internet based speed tests are very unpredictable due to all sorts of reasons (throttling, traffic shaping, congestion ... all of which are something that you will see a lot of on a "pile-em-high, sell-em-cheap" home grade connection) .... although Bredbandskollen (www bredbandskollen se) isn't too bad, even from way outside Sweden I can normally manage good throughput.
Have you taken your laptop elsewhere (internet café etc.) and ruled out possible hardware issue in your laptop (unlikely I know, but just to be sure !).
Truth is that most home wireless kit isn't really up to high bandwidth and you'll always get better results from a physical cable. However, that said, you shouuld be able to get better than 2 or 8Mb out of it.