Am I the only one to have this problem. After installing the Sundowner update last week, I noticed abyssmal frame rates, between 0.9 and 2 fps after opening the plane. Oddly, when that happened, I then opened the default C171, and still crippled performance. I did get the C23 into the air and went to the settings menu and clicked the "set for maximum framerat" button, and upon resuming the program, beautiful performance of 59-62 fps, but of course, blurry, featureless surroundings. One by one, I restored settings, and found two killer changes---going from, under shadows, any setting above "3D on aircraft", including any of the global settings, set framerate right down to single digits. Similarlly, engaging HDR rendering again killed framerates. Critically, I was able to use those high settings with no trouble before updating the Sundowner. Is it possibole that there's a glitch in the update that, when initiated, even affects the default aircraft. By the way, I had on a previous day gone into the system config menu of Windows and disabled all services, but running the Sundowner was still crippled, so I'm pretty sure the computer was not busy doing other tasks. At one occasion when Sundowner is so misbehaving, I found the CPU usage was only 25%, so again, I think the problem is within XD-Plane and not Windows. Any thoughts?? Thanks!