Is there any solution or it's just a general issue with most Tp-link routers?

This 'problem' with halving the speed limit is present in many if not all tp-link models, for example it is certainly present in AX50, AX23, AX10 etc.

Tp-link recommend to use QoS only up to speeds below 300mbps (they won't write it anywhere and say it officially, but one person from the forum support here has talked to them(with the QA team) and shared it in this forum)

What happens realistically is that the moment there is QoS enabled the hardware offloading of the processes is automatically turned off and everything goes through the software, where with these low speed processors, there is nothing else to expect, they can't do QoS at 1000mbps and so automatically reduce to around 300/350mbps. So that's completely expected and logical router behavior.

The real problem though is that on a huge number of their models there is no explicit option to turn off QoS, there is an option to put it on Standard and turn off all devices from Device Priority, which according to them should turn off QoS completely.

That's where the bug is with my model, that even with these settings it doesn't turn off completely and still does something, especially under certain conditions and traffic load it just turns on and limits everything.

Some models have the option to turn off QoS and quite a few others don't.
 

Does anyone have some fix for this?