I ran archer A7( same as C7) with openWRT before. While the ports are capable of gigabit speed, its processor is not up to a task routing a gigabit internet. I was getting around 200mbps through wifi.
I suggest to test on your ONT whether you are getting a gigabit speed as promised.
hi ballisticks,
out of curiousity i pulled of my C7 and installed the latest openwrt (23.05.2).
With software offloading through ethernet im getting around 200mbps.
Some people built openwrt with QCA specific feature enabled hitting 900mbps, but that was a long way back then.
Let me know if you found a good build.