Ok I usually run with 70% OpenXR and 85% Render scaling with settings medium/high. I changed this to 70% Render scaling and loaded up the Robin in London City with Orbx landmarks and London City DLC.
As you can see I’m getting 30 fps. Apologies for the screenie - used windows sniping tool to capture which lost a frame or two. Anyway, with a slower GPU, I got higher frames. Of course, if you’re in airliners that could be it? Still, London is a busy area but my traffic is cut back to around 20%.