One of the most important things I've found was to get Nvidia Inspector settings right and the most up-to-date drivers for you vid card. I believe that many of the updates fo drivers are helping Dx11 functions which are ignored in Dx9 programs. It is essential to have AA and Anisotropic on in game then, if you use an Nvidia vid card checkout post #10 in this thread for my NI settings.
I am persevering with Dx10 post Steve Parsons as it gives my old rig the smoothest ride yet in ORBX scenery areas.
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