First things first , simplify your setup . Turn off all phones pc ' s laptops , anything that has a net connection . Disconnect anything that plugs into the phone line , don ' t forget the sky boxes burglar alarm etc . Remove the face plate from your master socket tutorial link 9 VQNJGhUNHMPlug in the router to the master socket using a new micro filter if possible . Now connect a laptop to the router using an Ethernet cable , and run a speed test . this should report a speed close to what your isp quoted . If the speed is still bad , you have isolated the fault to either the bt part of your phone line or your router , so call your isp and tell them your findings . If your line speed is fine check your micro filters on other equipment in the house . Add equipment back into the system until the issue returns . Fyi wifi boosters , boost the range of your wifi link to the router , they don ' t boost the speed at which you connect to the internet . good luck