Seems like the wireless ac performance is CPU limited in any case. Is this with fast path active and connection tracking disabled? Fast path enabled and connection tracking set to auto. In tools::profile cpu load looks like: wireless ~ 85% ethernet ~ 10% Overclocking is not available in 6.34.1 firm...

Test case:
1. Site to Site
2. Remote client access for mobile and PC device ( show network speed for before VPN connect and after VPN connected ) Please use this website for speed test http://www.speedtest.net

I can't do it. My internet connection too slow for that.

That should give us a good overview of total bandwidth attainable using one stream and multiple streams both using large block sizes and small. My NAS can't use tcp window size greater then 320KB and for test with 16 connection some connections return - write2 failed: Connection reset by peer. Cpu ...

Could you also test VPN performance ( ipsec and openvpn ) ??

Yes. Can you describe more in detail VPN config and methodology tests?

Ok, dat looks ok, not great, but ok. Judging from your comment that it would connect at 1300Mbit your Macbook is a 3x3 AC version? Yes. It has BCM943602 chip with 3 streams for 2.4 and 5 networks Did you happen to note what the CPU usage on the router was? 90 - 95 % How was it configured? As an Acc...

My fast test result: http://take.ms/fAhKw
For test was used nas qnap-ts210 connected to lan (1 Gbit) and macbook pro 15" 2015 802.11ac (connection speed 867 - 1300 Mbits/s)
Traffic was generated with iperf