Unity Game Optimization - Third Edition

The heap

The heap represents all remaining memory space, and it is used for the overwhelming majority of memory allocation.

• Since we want most of the memory allocated to persist longer than the current function call, we couldn't allocate it on the stack since it would just get overwritten when the current function ends. So, instead, whenever a data type is too big to fit in the stack or must persist outside the function it was declared in, it is allocated on the heap.
• There's nothing physically different between the stack and the heap; they're both just memory spaces containing bytes of data that exist in RAM, which have been requested and set aside for us by the OS. The only difference is in when, where, and how they are used.

In native ...