+ The debug versions of *some* security-enhanced CRT functions fill the buffer passed to them with a special character (0xFE). This fill character helps to find cases where the incorrect size was passed to the function. Unfortunately, it also reduces performance. To improve performance, use **`_CrtSetDebugFillThreshold`** to disable buffer-filling. See [`_CrtSetDebugFillThreshold`](./reference/crtsetdebugfillthreshold.md) for more information, and a list of functions that have this behavior.
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