I should have been clearer. I was talking about two distinct issues:

* lack of hardware encryption support

* poor network performance (about 50% slower than with original firmware) - the issue I linked to

> lack of hardware encryption support

I don't think that the Archer C7 hardware (or most consumer router hardware) supports any kind of encryption acceleration aside from what's built in to the WiFi radios. If you want a hardware accelerated VPN, you need to either get one of the Cavium-based Ubiquiti routers or something with a relatively high-end processor implementing AES instructions.

The lower routing performance has largely been solved in 18.06 with software flow offloading.