*Ubiquiti - not Ubiquity :)

But as this is not offloaded traffic (meaning it uses the CPU of the router) it isn't quick. I recommend instead grabbing a Raspberry Pi and setting up PiVPN (https://pivpn.dev/)

Edit: @mdf has an excellent guide here: https://www.geekzone.co.nz/forums.asp?forumid=46&topicid=245015

Personally I'd advise setting up an L2TP server instead - it's hardware offloaded encryption, so it's quick, and you can secure it with certificates or PSKs (no TOTP though)

I have been running OpenVPN on my ER-X for a while now. There are a number of guides on the Ubiquiti site. OpenVPN has the advantage of being able to run in Layer 2 mode, which for me is very useful. As for performance, well I only have an ordinary fibre plan with the standard 20 mbits up, and this is the limiting factor.