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 !
It’s just another human being wanting to communicate to others something they found interesting and enguaging, you don’t need to read it (indeed you probabally didn’t since you are ignoring these sort of posts, which is totally fine and your own decision). Your preference not to read these sort of titles does not mean other peeople do not want to, or, in fact, that those same people are interested reading your views on the topic - live and let live, just don’t be rude about it.
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!