If speed performance is poor throughout the entire area, you should seriously consider connecting directly into the router via an ethernet cable.
Doing this will confirm whether the issue is the broadband speed itself – or whether there is an issue with the Wi-Fi signal itself.
If the connection is good when hardwiring straight into the router, try resetting the Wi-Fi.
This simple tip can often fix any annoying broadband glitches.
This involves switching off the router, waiting approximately 30 seconds then turn it on again.
Note, this reboot may take a few minutes and your home will be without broadband for this duration.