I don't know whether the OP has resolved their issues - this is an old post after all. That said, perhaps it will save some people future grief.
Like others have stated - the speed reported by 'Real Speed' on SamKnows is the total speed throughput to the Hub4. This is split across all connected devices. For the purposes of my testing I only connected 1 device at a time and powered off everything else.
I too opted for the 1Gbps service as soon as it was available in my area having being a BT customer previously. I also got MUCH slower speeds when testing with my gaming laptop. Not too dissimilar to those posted in the picture shown in the original post. My laptop has a 1 gigabit network card and is about 3 years old so you'd think it was well suited to take advantage of the full speed.
It turns out my gigabit card or the hardware it's connected within the laptop couldn't handle the full speed, at least not in a sustained transfer. I also have a wireless gigabit card in the laptop which reported slightly lower speeds. My Samsung S10 mobile fared slightly better at around 230Mbps though I've seen higher since.
However, the brand new gaming desktop I purchased a week after getting the Virgin connection reported 958Mbps first attempt. This was backed up by a similar 890Mbps reported using Ookla speedtest. I've tested several times since and I always get similar results.
I have worked in IT in the past and was sure my laptop should have been capable of taking full benefit of the speed. My advice - be 100% sure your hardware setup is capable of taking advantage. Unless you particularly want to have the full speed on one single device it won't really matter as several devices will still benefit.
To further backup the fact the Hub4 is actually delivering close to 1Gbps I tested my laptop, my phone, my wifes phone, my son's laptop and his phone all at the same time. The total was around 910Mbps.
One thing I would say - I suspect the WiFi on the Hub4 is as rubbish as any other hub. It does drop out rather annoyingly and often. This can either be fixed/ worked around by install your own wifi mesh net using something like the Deco or, if you don't want to spend the money, buy a digital time and plug the hub into it. Have it restart daily at say 3am. Regular restarts seem to reduce whatever affects the wifi dropouts - this has held true for almost any home hub I've owned.
