MT7622 open source driver, any findings on speed improvement

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.

See here for similar hardware with drastically better measurements (although no distance was mentioned): 802.11ax worse than 802.11ac with mt76 driver? - #37 by dekomote