Note that if you have 10mbps behind the modem, you are not expected to get 10mbps behind a router because of the router's and computer's firewalls. And, internet connection speed will be shared by all computers on your network that are connecting to the internet. To test, try shutting off other computers and check your speed in just one computer that has no internet security turned on.
Also, since you are wirelessly connected, wireless interference on the dap1522 could also degrade performance.