Performance of memcpy() vs CopyMemory

[Dyndrilliac]

I was told that using memcpy from string.h is faster than CopyMemory from windows.h. Is this true?

[R.a.B.B.i.T]

memcpy() is in windows.h (or stdlib.h, I forget which).  Unless you're doing something which would require absolute speed (like calculating intercept vectors for missiles), it really doesn't matter.

[Adron]

When you use memcpy it will typically be inlined and optimized by the compiler, while CopyMemory might not be. That's a possible explanation for a performance difference between them.