Tried NordVPN, Private Internet Access (PIA) and others
After a lot of experiment on my RT-AC87U and pulling of hair over *dreadful* VPN speeds i’ve come to the conclusion that it just doesn’t have the processing power to handle encryption overhead.
I can normally average 13MB/s down from home, with a VPN i’d expect this to go to half or 2/3 because of the overhead, but using the router-based VPN client i was lucky to get 1MB/s which was totally unsatisfactory.
I switched to command line OpenVPN on my desktop and speeds are within the expected range 5–7MB/s
So unfortunately, the moral of this story is — don’t use the RT-AC87U’s built in VPN Client if you want good speeds!