In this screenshot I see that one of your wifi radios has a signal to noise ratio (SNR) of -70dBm, which is not very good. If that is the one you have measurements for, then it could explain the abysmal transfer rates. You should try to find out why it is -70dBm and if there are things you can do that would decrease that value (e.g. moving your devices, using different cables, etc.)
There could be many reasons for this. One thing you could try is to increase or decrease your power levels. Yes, you hear right. Decreasing powerlevels can lead to increased performance, because if there are many devices they may interfer with each other. An easy to understand analogy: Imagine a room where everybody is shouting at each other. Nobody will understand, because it is too loud in general. When everybody whispers, they will be able to understand their neighbour at the very least.
Thanks for the suggestion. yes the signal is so weak with open source driver, i literally have to tap my phone on the router in order to get close to 500Mbps. mtk driver does not have this issue.
Will try to decrease power and see if can get improvement.
you also could try to use different devices for measurements. I have seen somewhere another forum post observing issues with Apple devices disconnect and going into powersave mode or something with weak signal like 70dBm, but I don't have an Iphone, so I naturally cannot provide proof.
I can reproduce the problem and also confirm it. The problems do not occur with the MTK driver, only with the open source. This has nothing to do with the devices (iPhone or similar) that dial into the wifi. Can't we just track down the problem and not keep making excuses. This is not meant personally, but apparently no one feels responsible for it. I would do it myself, but I am not a developer.
yes, there definitely is something going on with driver/firmware or other wifi related software at the very least on mt7622 and mt7915 devices when it comes to 802.11ax (EDIT: the issues I refered to are probably (but may not be) related to mt76 driver!), but you also cannot deny that jamestien has not provided enough evidence to completely rule out that it is some kind of configuration issue or there is some kind of signal interference caused by other devices in the house.