With OpenVPN, yes, you'd get around 200 mbit tops - the thing is OpenVPN is single-threaded and a 1.5 GHz ARM core just isn't enough to cut it. I have an 1.8Ghz

With OpenVPN, yes, you'd get around 200 mbit tops - the thing is OpenVPN is single-threaded and a 1.5 GHz ARM core just isn't enough to cut it. I have an 1.8Ghz ARMv8 in a router and it peaks at ~240mbit, pegging a single core at 100%. Similarly clocked x86 core would fare much better and that's what I'm thinking of upgrading to. With Wireguard you should have a much better performance however as it's multithreaded and rpi4 offers you 4 cores.