I have got X Plane 11 demo running on my PC and also X Plane 10 demo running on my PC. I can have X Plane 10 graphics on high with it running really well at about 55-60 frames per second. When I go onto X Plane 11 I put the graphics on low and when I start rolling down the runway the surroundings jolt to the side. When I get to about 80 knots it starts to run at about 10-16 frames per second. I have done all the updates when they come out but it doesn't change anything.
System: Intel i7 6700K, 16 GB DDR4 Ram, MSI AMD Radeon RX 470 4GB Graphics Card. Both X Planes on my SSD.