I made a factiry reset more than 10 times. I tried 4 Asus firmware. I tried this one https://github.com/paldier/bluecave-merlin/releases with the same result. I use 80MHz bandwith. I turned off/on MU-MIMO and a billion others switchers. I tested speed in torrent and speed test over PC, MAC...
I've bought the new Asus Blue Cave for better speed via WIFI. I have a 1 gbit/s for both directions.
Now, I have for about 250-350 mbit/s usiing Mikrotik HAP AC, but I want more speed :) and MU-MIMO for parallel downloads and TV strimming.
So, I upgrade router to the latest firmware and get...