> A modern CPU has 200Gb/s of bandwidth. If the objects in your array are 200 Gb in size each, then swapping the position of two elements in a vector is going t

> A modern CPU has 200Gb/s of bandwidth. If the objects in your array are 200 Gb in size each, then swapping the position of two elements in a vector is going to take O(seconds) at memcpy speeds, Not necessarily. If those items are aligned to a memory-page boundary, memcpy will probably do a page table update instead of actually moving the values in RAM.