Year old thread, but..
This is not true. QoS is completely independent from how fast your network is.
QoS applies
prioritization. Without QoS, if you max out your connection with a transfer, all other data gets traffic jammed. This is disastrous with latency sensitive data like games, VoIP and streaming services. Latency goes through the roof, they can hang for multiple seconds at a time.
With QoS, you can still do all these things with minimal degradation. There is still some, yes, but it's orders of magnitude lower (30-50ms increase) than without any QoS at all (7000ms).
When I upgraded from a 200/35 cable connection to 1G symmetrical fiber, I ran into the same issue as posted in this thread: Terrible network performance with QoS enabled. It didn't matter what QoS I tried using, the transfer speed was crippled. The only 'solution' was to disable QoS and run into the awful problem of not having it anymore, or deal with erratic 20-60% lower transfer speeds than I'm paying for. This is ignoring bufferbloat issues too.
Been using QoS since my first "gaming" router (D-Link DGL-4100) from 2005. I even invested into Bigfoot's Killer NIC because it provided tangible benefits over generic onboard crap (especially for UDP). I've been a competitive gamer and I also play some
lockstep games, and consistent low latency is extremely important in both these cases. I also live with a family who's become more and more digitally oriented. QoS is a godsend for people like me.
Surely there's a router out there that either has a CPU powerful enough for at minimum 1G QoS, or is multi-threaded? This can't still be a bottleneck in 2024.
With how many ASUS routers have had glaring flaws (former 87U user), I'm close to not caring anymore and will even consider paying for enterprise hardware...