One of the answers on this Stack Overflow question <http://stackoverflow.com/questions/3628081/shared-ptr-horrible-speed> suggests that we can fix the memory issue by using `making_shared`:
> *use* |make_shared| <http://en.cppreference.com/w/cpp/memory/shared_ptr/make_shared> *to allocate them*, because (unfortunately) the normal constructor allocates two different blocks: one for the object and one for the counter and deleter. Unfortunately, it looks like <http://nerds-central.blogspot.com/2012/03/sharedptr-performance-issues-and.html> they're really slow because they're thread-safe, but that may also apply to RefPtr.
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