My Net 750, slow upload speed

well I have a question, a couple of days ago i bought a new router ( WD My Net 750) at home I used to have an uploading speed of 2.5 Mbit/s but after installing the router the speed is reduced to 0.8 Mbit/s ! can anybody help me to restore my old speed !???

Make sure the FasTrack QoS settings are correct for your upload speed.