If those ping times to 192.168.1.254 remain the same when the connection speed falls, then the WiFi connection is good. If that is the case, see what the download sync speed is. It might also be possible, in one of the menus on copper-based broadband routers, to see the SNR (signal to noise ratio). I'm guessing it should be somewhere around 20dB on a decent connection. Higher would be excellent. 7 to 10dB would be marginal.Just having a play with the ping command. Who do I ping? Default gateway, primary and secondary DNS no go, even though everything's working at the moment.
Edit: hub gateway IP address 192.168.1.254 gives back all four pings within 1ms, so that's nice.
Left it running for a bit:
Ping statistics for 192.168.1.254:
Packets: Sent = 153, Received = 153, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 5ms, Average = 1ms