Local arrays

Hello!

I have some subroutines like this:

pure subroutine Sub1( X, Y )
  real, intent(in) :: X(:)
  real, intent(out) :: Y(:)
    real Z(SIZE(X))
      ....
end subroutine

pure subroutine Sub2( X, Y, n )
  real, intent(in) :: X(:)
  real, intent(out) :: Y(:)
  integer, intent(in) :: n
    real Z(n)
      ....
end subroutine

pure subroutine Sub3( X, Y, n )
  real, intent(in) :: X(:)
  real, intent(out) :: Y(:)
    real Z(100)
      ....
end subroutine

In subroutine Sub3 array Z will be static as i know. But what about Sub1 and Sub2 ?  Will the array Z in Sub1 and Sub2 be allocated each time when the subroutine is calling and will the speed of execution of Sub1 or Sub2 be decreased compared with Sub3?

thank you