@Boltonite  

As Range extender receives data from the router and then forward it to the connected clients and speed will decrease during the transmission, sometimes the speed could cut to half. Thus,  we use it more to increase the stability in Wi-Fi dead spots rather than boost Wi-Fi Speed. To check if that is ordinary speed, can you help provide some information below: 

1. with RE unplugged, test router Wi-Fi speed at RE's location

check Wi-Fi Link speed on your device when connected to router: 

2. RE wired speed if possible

3. RE 5Ghz Wi-Fi speed and Wi-Fi link speed when connected to RE

4. Model of device 

For' Homehub router is ping 3s download 548 mbits and upload 429 mbits. ' May I know is this the Wired speed or Wi-Fi speed from router? 

Thank you.