You can maximize the throughput speed on the 04AC and 05AC models as follows:
First log into the settings menu via http://192.168.4.1 (default username root and password ecowifi!).
- Adjust the channel bandwidth to 80 MHz in the Basic -> Network settings menu.
- Configure the router as a switch, as explained in the manual on page 8, to mitigate NAT bandwidth limiting.
Speeds up to 400 Mbps should then be achievable on the 5GHz AC network.