R7000 QoS Device Prioritization not working with most recent Firmware (V1.0.9.64_10.2.64)

DarrenM 's Question: Nope, not yet since I also don't remember which one was still working, unfortunately and the security issues, that were present in those, I don't want to risk "rolling back" into really.

To answer the second question by shadowsports  :
I've got a 200 MBit/s Download and 12 MBit/s Upload by Cable Vodafone here in Germany since they offer the best value for the already - in comparison to other EU countries quite old network infrastructure in general - relative expensive plans here in this country and the throughputs are decent.

I've just turned the QoS off completely yesterday and the reaction time for websites and in Games seems to have significantly improved, even with these - in comparison to possible maximum Gigabit-Speeds - "slow" speeds I get with my plan.

I might just keep it that way and was even giving the possibility of DD-WRT Firmware an eye now since they seem to have developed some decent firmware for the device, too.

Thanks for the suggestions and feedback though and hope mine helps with hopefully making better firmware for the next version launch somehow still.