C++ : Why does THREAD_MODE_BACKGROUND_BEGIN cause my code to run 20x slower than THREAD_PRIORITY_LOW

C++ : Why does THREAD_MODE_BACKGROUND_BEGIN cause my code to run 20x slower than THREAD_PRIORITY_LOWEST?
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C++ : Why does THREAD_MODE_BACKGROUND_BEGIN cause my code to run 20x slower than THREAD_PRIORITY_LOWEST?
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