It's a false choice. 64-bit is the future, right? So the 64-bit transition is probably approaching inexorably. Optimizing data structures will be just as good i

It's a false choice. 64-bit is the future, right? So the 64-bit transition is probably approaching inexorably. Optimizing data structures will be just as good in 64-bit. Actually, it will be even better, because the wasteful data structures will then expend twice as much memory on pointers and become even more wasteful.