Well I hope this is not a major issue but having finally got VorpX to play nice,Ralf has posted some tips
to get 5K+ users up and running,so this is the first time I have dropped the hertz.
At 90 all fine and dandy no flicker,but on both recent updates as soon as I drop it’s of like a semi demented moth on acid,this could be a bit of a bummer as the dev states 72 is the best and most stable way to run VorpX.It is not even random it’s in intervals of 3 secs or less.which aint normal 
Running on a rare as rocking horse poo Vega64,anybody else had this issue ?