Many households don't know how to optimise their home to receive the best possible broadband connection, the Post Office believes.
According to a new study, 28 per cent of households place their main Wi-Fi router next to their TV or other electrical appliances.
Figures also showed that a further 24 per cent are placing their routers by windows, shared walls or at the top of the house.
This means that more than half of UK households might be exposing their routers to signal interference, which in turn can negatively affect their internet speed.
Meredith Sharples, Managing Director of Post Office Telecoms, commented: "Many are not aware of the simple steps they can take to ensure their home is optimised to receive the best broadband connections possible.
"We are increasingly reliant on the internet for so many aspects of our lives and it’s therefore so important that we can trust in the reliability of our service."
As well as keeping routers away from electrical devices, thick walls and windows, the Post Office recommends ensuring they are plugged into the master socket - usually where the phone line enters the house - rather than an extension.
This, it stated, will reduce the chances of a property's wiring affecting the internet speed.
Households were also advised to make sure their routers are password-protected, as otherwise anyone could use their Wi-Fi and slow their connection down.
The Post Office added that getting the latest browser could also improve download speeds in the home.