@Virgo I am not at all convinced it is a firmware revision issue - if it was, there woud be a lot of people complaining. I was just reaching out to see if anyone had any other thoughts on what might be going on. There are seperate SSID's for 2.4 and 5Ghz, so it is easy to connect to the 5Ghz.

I first noticed an issue immediately after installing the 5G external router - I was stood on the roof, tested direct from the Zyxel external router that has a 2.4Ghz wi-fi only for testing via their app, and saw 120Mbps, then connected to the wi-fi, and was getting just 10Mbps. From indoors, in touching distance of the AP, still the same - even worse on some attempts - switching to 5Ghz or using an ethernet cable and 120Mbps and above.

  @Fozzie 

Hi,

with an EAP225 V3 (5.1.1) @20MHz I get ~27MBit download (Android 1x1 client).

Switching to 40MHz shows ~78MBit.

Win 11 notebook with intel AX160 (2x2) wifi switched to 2.4GHz: ~115MBit.

Used speedtest site: wieistmeineip. de

What type of client are you using for testing wifi speed?

  @d0ugmac1 I think the reference to 30Mbps was from @diddi, rather than me - I was only seeing 10Mbps on the 2.4Ghz channels.

- The AP's all have their channels set, so as not to interfere with an adjacent AP.

- the test client radio saw 120Mbps when connected to the Zyxel 2.4Ghz maintenance wi-fi, so should have seen similar on the TP Link APs

- I did wonder about interference / BT / uwave / etc, but there was only me and one other at the property.

- As , said, I only got 10Mbps - the ref to 30Mbps was someone else. The reason for going 5G and new pole-mounted router, was because at 4G, they were getting 30Mbps or so over the 4G radio, to the 5Ghz and hardwired devices (I didn't test the 2.4Ghz TP before a swapped the 4G router for a 5G one, which is a pity!). An XBOX decided to do an update of Call Of Duty in the middle of the afternoon, and it ran flat out, at 30Mbps for hours - stopping anyone else doing anything - that was the catalyst for going down the 5G route (and near 200Mbps download!)

- funny you should say "unless you are out in the woods, off grid" that pretty much describes this location: it is a lovely property with around 10 bedrooms and out buildings, set on the banks of the River Orwell, a long way from any other properties that could possibly interfere with their wi-fi!

They are using the 5Ghz channels fine (see below) - It was just the odd behaviour at 2.4Ghz seeing no more than 10Mbps that does not make any sense, and I'm interested to work out why...

  @Fozzie Tried to paste a graph showing nearly 100Mbps of WI-Fi throughput over the Tp- links yesterday!