Please provide more details
- what device/age of kit/pc are you using
- speed with wired connection
- contracted speed
- have you tried other speed test sites?
also try splitting bands, changing channels and see if a neighbouring hub is interfering (check with inSSIDer)
and check if Wi-Fi drivers are up to date.
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I know a bit about Wi-Fi, Telecoms, and TV as I used to do it for a living but I'm not perfect so don't beat me up... If you make things you make mistakes!