Slow speeds with Powerline

[SimZZZ]

I have a Hub3 with Powerline adaptors sending Wifi to my upstairs and garage. I have recently moved from BT, which I new regret, as I have nothing but trouble and instabilty with Virgin.

With my old (and I mean OLD, it was 3 years old) BT router I have no problems getting maximum broadband speeds upstairs through my Powerline. But with Virgin I find the maximum speeds I can reach are around 70Mb/s (out of 250-270Mbs dowbstairs). If I connect direct to the router via ethernet cable I get full speeds, so it's something to so with how it reacts to Powerline. 

I have seen lots of similar posts from people, with no solutions. Interesting, I was at my sister's in London over the weekend, and she has exactly the same issue, absolutely identical. 

Has anyone managed to find a solution?

[carl_pearce]

Powerline adapters are limited by several areas:

• Age of house wiring.
• Ethernet port speed on powerline adapter (Some are 100Mbps, some 1Gbps).
• Distant between the powerline adapters over house wiring.

70Mbps is pretty good to be honest.

What is the exact model of powerline adapters you have?

[SimZZZ]

The actual throughput speeds on the Powerline system is between 300Mbs and 800Mbs as measured by the app and independently. As I said, I was getting 3-4 times the speed I get with Virgin through my old BT router, so it's not the Powerline that's the problem.

[carl_pearce]

So you had Fibre broadband with BT?

If you access the HUB and sign in, then check the 'Connected Devices' section you should see the connection speed of each wired and wireless device.

What does the powerline adapter show? (Should be 100 or 1000).

[SimZZZ]

speed is 1000 as expected. and yes, we had fibre with BT and we had same speeds downstairs as upstairs. I have found lots of posts online with exact same problem, and my sister has identical setup and also has same problem

[carl_pearce]

And what broadband connection did you have with BT?

Edit: Not sure then. If the HUB has negotiated 1Gbps connection speed with the powerline adapters I don't see how the HUB would be limiting the speed. Did you use the same ethernet cable when testing connected directly to the HUB?

[Adduxi]

Have you reset the PLA’s since you changed? If you have a switch handy, test the PLA by putting the switch between the Hub and the PLA. Just in case the Hub is not negotiating the NIC speed correctly? 

[legacy1]

Due to how much bandwidth the hub can bond out the 1Gb port vs a slower output back to back packets output with VM this causes the Powerline adaptor to be overwhelmed causing TCP to slow and speed up within 1000ms vs a slower input steady speed to the Powerline for more speed within 1000ms.

The problem is the Powerline buffer being too small but no one want to increase this in their products    

[SimZZZ]

if the Powerline is the issue, how come it worked fine with the BT router? Better than fine. 100% stable, wifi speeds through the powerline >200Mbs

And yes, Powerline has been completely reset.

[Client62]

Note : We still do not know the speed of the previous BT Internet connection.

Do you have a laptop that can be plugged into the VM Hub to run
a direct connected speed test over a network cable ?

This is a handy link to diagnose where speed is being lost :
https://www.samknows.com/realspeed/

Once the test begins click on: Run full test to see all the stats.
The speed at the Hub should reflect your subscription.
The speed at the device can vary.