This time it didn't drop to 36 fps on the 2nd sequential session. Update: I just sequentially ran 3 sessions of X-Plane 11 in OpenGL mode, and was around 46-47 fps at that same spot. Could it be that threaded optimizations stopped working on the 2nd session in OpenGL? I wonder since that feature in the drivers gives me about a 20% performance boost in X-Plane 11 in OpenGL but does nothing for Vulkan mode? So I'm not sure what the true fps in OpenGL should be on my 5800x, 36 fps or 46 fps. This strange anomaly in OpenGL mode never occurred when I was running X-Plane 11 on my i7-4930k system, which is now out of commission, but it seems to only be happening on my Ryzen 5800x system with the same GPU installed. However, something strange happens when I exit X-Plane 11 and restart X-Plane 11, next time the frame rate is around 36 fps at that same spot and this happens just in OpenGL mode. I get around 46 fps in OpenGL (with threaded-optimizations enabled) in that exact same spot and same settings except in OpenGL mode in Windows 10. However, I tested OpenGL in X-Plane 11 in Windows and I'm getting a higher frame rate in OpenGL with threaded optimizations turned on in the drivers, at least in the first session with OpenGL mode. I haven't tested OpenGL in X-Plane 11 in Linux.
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