I should also add that avoiding pre-emption of that main thread is a good thing, hence why running MSFS 2020 at High priority can result in smoother graphics. That main thread then can’t be pre-empted by any Normal or Above Normal priority Windows background process and can sit on that core as long as it wants, doing whatever it does. Obviously, there is a limit to single-thread CPU performance and when you hit it you have nowhere left to go…other than overclocking or upgrading. This is Amdahl’s Law at work.
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