I have tested with TorGuard, Nord, and multiple ports, endpoints, protocols.... and the ASUS RT-AC5300 CPU isn't being taxed heavily.
WAN: 800+Mbits direct from OS-X, Windows, or spdMerlin from AC5300
VPN: 100+Mbits direct from OS-X or Windows clients via WiFi
VPN: 80+Mbits from spdMerlin from...