Router, wifi, entender test speeds

[wireless]

I have OPTIK Fibre with expected speeds of 300 mbps.

The Router, when tested, gets incoming speeds at approx. 300 mbps
The wifi Plus extender, when connected to it, gets test speeds at approx. 300 mbps
The Router '5G wifi' speed is about 150 mbps at best even when I am standing directly next to it.

All these tests performed on the same device.
Other devices show the same test results.




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