Jumbo frames not (and never has been) enabled. Yes, I think my next investigations is going to be the VPN itself. If I ever track this down I’ll post back just for closure :) Driving me nuts!

I have tried smart queues on and off - no difference. The VPN is terminated on the client at my end - this is why I am finding this so confusing. Someone else has suggested it may be my ISP throtttling VPN traffic which actually would make more sense than the USG processing power to my mind. :(

{edit} mind you - that would not impact local network traffic so that cannot be it !

Agree with this, I have just built a new gaming box (first time in 10 years - wow stuff has changed!). Anyway, I daily drive Fedora on my laptop and just automatically put in on the new rig - it took a LOT of tweaking to get it right for gaming (working like a dream now). In hindsight Nobara sounds like it would have saved me a lot of time