I just tested the peroformance with dd-wrt with an quite up-to-date version and achieved around 600 Mbit/s via Wifi on my S7 (2x2 max 866 Mbit/s) with an Iperf3-Messurement to an 1GbE-internal Server. so i guess the performance can only decrease with openwrt.
Major-Reson for Openwrt in my opinion is still a hopefull possibility for building MESH-NETWORK with diffrent OPENWRT-Devices around my house. But I guess that is an impossible projekt since I am stucked for years now with this issue. - Most cheapest and working option would have been what I tried to prevent. Buy AVM-Products, connect them with one button within 2 Minutes and just be happy enjoy maximum performance where still Wifi AX-Devices even with best client won't achive nowadays.
I haven't seen any AX-device real iperf3 messurement higher than 600 Mbit/s up or down.
But I hope this very promissing R7000 openwrt development keeps going here!
Could anyone please report their R7000 messurements and maybe MESH-experience?