CONTIGUOUS Flag for Dummy Array Arguments

While documentation says that the compiler will make more optimizations for subroutines that use the CONTIGUOUS flag, I thought I ask if this is true of the Intel Compiler.

I always pass to my subroutines contiguous slices such as X(:,:,2:5)

An example subroutine would be:

SUBROUTINE MYSUB(X,Y,Z)
REAL, DIMENSION(:    ), CONTIGUOUS, INTENT(INOUT):: X
REAL, DIMENSION(:,:  ), CONTIGUOUS, INTENT(INOUT):: Y
REAL, DIMENSION(:,:,:),             INTENT(INOUT):: Z
CONTIGUOUS:: Z

...CODE...

END SUBROUTINE

Does the compiler do any optimizations on X,Y, and Z or is this an unnessary keyword. When is it best to use this?

Thanks in advance