[CyberDildonics]

This is extremely poor advice in practice.

Memory mapping, pages and organization of the heap means that allocating as much memory in as few chunks as possible and reusing it if possible stands out when you profile the two different approaches.

Even if tiny chunks are allocated in their own arenas, the overhead of the allocation and dealing with the pointer it returns is still unnecessary compared to just dealing with the numbers on a loop through an array and moving on.