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_CRT_DISABLE_PERFCRIT_LOCKS

Disables performance-critical locking in I/O operations.

#define _CRT_DISABLE_PERFCRIT_LOCKS

Defining this symbol can improve performance in single-threaded I/O-bound programs by forcing all I/O operations to assume a single-threaded I/O model. For more information, see Multithreaded Libraries Performance.

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