You're right, it is 8 Go of RAM, and 3 Go VRAM, my other spec are Intel i5, 2.3 GHz
I get 60 fps with VSYNC on. With VSYNC off, I get 120 fps on San Francisco with ultra/ lens flare on / vulkan / anti aliasing on.
With my Acer VR mask, I also get a very good quality and frame rate with the same settings.
So for me, my PC is still very good for the Aerofly FS2 simulator, which I consider to be the best one for graphic quality optimization.
I am just disappointed about Paris DLC, because I thought that I would get the same performances when I bought it.
But I should have paid attention to the minimal requirements on the Steam store page ...
I tried your settings advice (medium shadow and disabling lights), but I still get a crash with Vulkan.
I will also try different settings with OpenGL to get the best fps.
Above Etampes airport (N48.38°, E2.07°), I get 130 fps. With my today's tests, I didn't have the same problems about landing.
I am not sure why, may be the total time flight, I will investigate.
Thanks for the help. At least I can use this Paris DLC which is of course beautiful!