Wi-Fi

Get one of the apps for a phone that shows nearby WiFi. Usually there's a major channel overlap. Trouble is that each channel straddles several - but there may be room for optimisation.

Either that or RF noise.

If you have an android phone/tablet try

Which will tell you which channel you are using, and which your neighbours are, suggesting better channels

Have you done some form of 'site survey' for nearby strong WiFi on the same or nearby channels?

Had variable WiFi performance here, finally traced to the Billion router. When it was replaced with a different make, WiFi performance throughout the house improved dramatically - in a spot upstairs remote from the router the download speed is now 40Mbps, and at the TV it's

Check the wifi settings in your smart hub via the laptop. As others have suggested, run a wifi analyser but on the laptop. When I had windows I used inSSIDer.

Recently discovered that poor wifi performance was being caused by a Bluetooth dongle that I'd installed in my PC. Then after I had removed the dongle and the wifi had improved I found that my Asus DSL-AC68U router has a 'Bluetooth coexistence' setting that was disabled by default.

Or Acrylic Wifi for Windows.

Thanks - downloaded and registered. Of course it would be that it's OK at the moment. Getting about 26 Mbps download. It's a bit densely packed round here - getting about 20 signals within range. And one next door neighbour isn't online. ;-)

That's a good reason to consider 5GHz, less neighbouring signal will make though your outer walls.

There is also this:

I have foil backed plasterboard EVERYWHERE. In general wifi is on a 'per room' basis.

I may start at 75Mbps but eventually multipath will negotiate that down to 5Mbps or less - 1Mbps even.

resetting the wifi on my PC is all that works. Its broadcomm hardware.

I havent yet thought about getting a USB/Wifi dongle.

I have three access points with different SSIDS on different channels