Falcon1986

This highlights that you should find out from the person who pays. ISPs are known to allow for higher-than-normal "burst" speeds when their network isn't congested. Furthermore, if your ISP has speed test servers that are part of speedtest.net, speeds can seem higher than what you're paying for. You might just be on a 48-50Mbps internet connection, that occasionally bursts to 100Mbps. What are your speeds at fast.com, openspeedtest.com and waveform? I'd have to disagree. Different generations of WiFi are able to achieve different speeds. Most of us who used 802.11b/g hardware will know. Furthermore, most people's WiFi setups are sub-optimally set up. I'm not arguing with that. It was a simple question. You'd be surprised at how many people reveal their setups until the 10th reply in and that's where we discover something problematic. Unfortunately, we're not mind readers here. A fast and easy solution doesn't fit everyone. If you're patient enough and can constructively participate in the conversation, someone will help you find a solution.

@Avocheeseado So is this layout correct? SPNMX55 -> PowerLine -> BT Mesh node

What would be very helpful is a network diagram with make/model labels for all relevant hardware and how they're interconnected. PL can be blamed for a lot of speed and latency issues. It's one piece of network technology that is plagued with problems. If you're using them, I assume you would have accepted these limitations. So you have 2 routers connected to each other? This is the setup that your ISP put in your home? Are these speed tests performed while connecting over WiFi? How far are you from the mesh node? My memory of house construction in the UK is that even internal walls are made of thick, solid brick. If the WiFi going through walls/floors when you're doing these speed tests?

Are these the speeds that you're paying your ISP for? What is the type of internet connection? WiFi speeds are much more variable than ethernet. If you're in 2.4GHz from the WiFi 4/5 generation, for example, you're unlikely to ever reach 100Mbps in real-world scenarios. Additionally, the rate at which device A is able to send data to device B on the LAN is dependent on the speed of CPU/storage hardware on each device. Post a network diagram sketch, highlighting the exact make/models of all network devices and how they're connected.

What do they provide? Wireless? Ethernet? What are you calling slow? Wireless? Ethernet?

Most common cause is wireless interference. Interference can be due to overlap with your neighbours' WiFi broadcasts or other appliances that use the same bands as WiFi (e.g. cordless phones, Bluetooth, etc.). You can detect the former with a WiFi Analyzer tool. When you reboot the wireless router, you force it to scan the spectrum for the best available channel (provided the antenna channel selection is to 'auto'). That is a temporary fix because if the spectrum in your area is already heavily congested, it's only a matter of time before a neighbour's broadcast decides to overlap with yours again.

You're on WiFi. There's always latency on WiFi. Ethernet. Plug in directly.

As in the ethernet link to the PC goes through an ethernet coupler? What type of ethernet cables are you using? A make/model would be very helpful.

This is a very specific problem that the ISP's technical support (higher level of technical knowledge) should be able to help you with. Seeing as there may be very few people on this forum who can help (I'll call out @Alex Atkin UK since he's familiar with UK ISP stuff), I'd suggest you ask in the Plusnet Community forum. At this point, since you're using your own hardware, you've isolated yourself to being "your own support". May I ask why you chose to replace the ISP's gateway with the TD-W9960? Comparing the specifications of it to the Plusnet Hub One, I'd be interested in knowing what you upgraded.

Definitely! Unless your ISP does not care about who connects to their fiber network, they usually have to authorize access by allowing not just the right credentials, but the right hardware signature. They should also be helpful in getting you set up faster than what we are "guessing" that you need to do.

I don't think you're supposed to edit anything on the TR069 connection profile. That's the ISP's "back door" into your ONT. IP acquisition should be set to DHCP on this connection. Look for another connection profile like "Internet". You should be able to use PPPoE credentials there.

That's the problem with Powerline. The quality of the link between the 2 adapters can change dramatically when appliances on the same circuit turn on/off. Power-cycling each adapter forces them to re-sync, but that's only temporary. In my opinion, Powerline should have been retired a long time ago. Because of its frequent link problems, it should only be used in peripheral applications where clients don't need much bandwidth or uptime. You're stuck with doing what you're doing now unless you link the modem to router with ethernet.

This is what happens when you're an early adopter. You'll have to deal with all of the incompatibilities and quirks until more people start using the technology. Not sure what is "dishonest". Here is what I think you're not fully understanding. While your XB8 has a 6GHz antenna to broadcast WiFi to WiFi 6E clients, access won't necessarily be available all of the time, especially when you realize that the wider you go on channel width on 6GHz (and even on 5GHz), you're bound to overlap with DFS channels. 6GHz is not exactly an "unoccupied" band; like 5GHz, it's utilized by "incumbent services" like microwave, satellite, mobile, astronomy, etc. If any of these services are being heavily used in your area, they can interfere with your signal. OK. So you seem to be upgrading all of the WiFi adapters but not taking one other thing into consideration. While adapter upgrades [and relevant driver upgrades] from one generation to the other will generally work for most people, you haven't really upgraded the physical antennae. In the majority of cases, this is not relevant, but keep in mind that the antennae that came with your laptops were tuned for the adapters that were placed in them from the factory. Upgrading the adapter, especially in a laptop that isn't too old, should still work, but it likely won't work as well compared to devices that came with WiFi 6E/7 directly from the manufacturer; e.g. your phone.

Who is your ISP? Flow, Digicel, Starlink? Are you running these tests over WiFi, ethernet, through any other medium (e.g. Powerline, WiFi extenders, etc)? Is anything else running in the background (either locally or on the network) that might be consuming bandwidth at the same time?

So the PC(s) with the WiFi 6E adapters can see the 6GHz but cannot connect to the network?