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Does your ISP use PPPoE? You will need to disable smartboost to reach 1gb speed if that's the case. Edit: Hmmm nevermind.... even with smartboost on, you should at least reach 800mbps with PPPoE

Early Access? Is that something I could join?

Is it the "Intel Ethernet Controller l225-V / l226-V" that you are using? Those chip's are know for having issues like you are describing. Try updating the driver to version 2.1.4.2 or newer, it should help.

Yeah it's a bug with the .40 firmware if you use PPPoE. I'm having the same issue, hopefully it's fixed in the next update.

You need to enable SmartBoost to configure CC to Always on.

It seems like PPPoE is the issue, here is a speedtest with a Friztbox 7530 AX handling PPPoE & R3 DHCP.

Could you disable Smartboost and check your speed & post your results? The issue I'm having is with Smartboost disabled, it lowers my upload speeds.

The ONT is a Calix 801G GigaPoint v2 - Which is standard for CityFibre installs. https://support.aa.net.uk/CityFibre_ONT It doesn't have a GUI or that, it's purely a modem for FTTP R3 is the only router been used (PPPoE)

Yes My ISP is Zen, but the Fibre lines / infrastructure is through "CityFibre"

Ah yes how silly of me! - Okay Congention Control is working fine I can confirm. But the low upload speed with SmartBoost Disabled is still a issue on .40

I've tried enabled & disabled - Same results Speed Test Bypass seems to do nothing or congestion Control isn't working correctly on Firmware .40

Default settings Auto

@Netduma Fraser For some reason, my upload speed is low with SmartBOOST disabled with .40 About 70Mbps When I enabled SmartBOOST, it's over 800 Mbps

@Netduma Fraser "It wasn't an Adblocker bug specifically but: There were some last minute blocker issues that were caught preventing the update being released"

VDSL requires a modem, so I would just keep your Friztbox & use it solely as a modem. Disable the Friztbox WiFi and put the R3's Wan IP into DMZ.