Correct me if I'm wrong, but won't the speed depends on the compiler, the operating system, the hardware... There is no particular reason you can't allocate 50

Correct me if I'm wrong, but won't the speed depends on the compiler, the operating system, the hardware... There is no particular reason you can't allocate 500GB in 1 cycle. Just get rid of all memory management. It seems silly to answer a question about C++ in operations per second, besides.