If speed performance is poor across the area, seriously consider connecting directly to the router via an Ethernet cable.
This will confirm whether the problem is the speed of the broadband itself – or whether there is a problem with the Wi-Fi signal itself.
If the connection is good when connecting directly to the router, try resetting the Wi-Fi.
This simple tip can usually fix annoying broadband failures.
This involves turning the router off, waiting approximately 30 seconds and then turning it back on.
Please note that this restart may take a few minutes and your home will be without broadband for that period.