Poor Ethernet performance on Google Wifi (AC-1304)

I installed the latest snapshot, and I just can't seem to pull any more than 200Mbps down from my 1000Mbps service. I've tried enabling all the offloading options along with packet steering. I gave irqbalance a go. Does anyone have any tips or experience dealing with this device?

You're not going to get 1gbit routing out of it.

Do you happen to know specifically why? The hardware is quite capable and with stock firmware it's a 1Gbit banger.

I should clarify because I just realised the title could be misleading - I'm connected via Gigabit Ethernet, not Wifi. I can only pull 200-250Mbps and it's killing me heh.

Because stock fw includes optimization/acceleration not published/available in Linux.

On my AC-1304 the NAT performance can deliver ~660Mbps when I tested with snapshot quite a few months ago, not 1G but won't be 200-250M speed