I'm looking for a router to basically use as hardware for an OpenVPN client. I just got an Archer A7, installed and configured OpenWrt 21.02.1 and OpenVPN client for it. Everything's working fine, but the internet speed is terribly slow when the client is enabled (5-10mbps going through a VPN server that shows around 100mbps with the OpenVPN client running on the computer). I believe the bottleneck is the processor, as the CPU usage of openvpn process hangs at around 90% while running speedtest.
Would anybody be able to recommend a relatively inexpensive router with good OpenWRT support and a CPU faster than the one in the Archer 7 (I believe it's Qualcomm Atheros 750MHz)? A forum topic to check out would also be really helpful (sorry, I wasn't able to find one for this particular issue).
Also, if you think the problem may be somewhere else, please advice.