D on quora ...

[Atila Neves]

On Monday, 16 October 2017 at 14:14:50 UTC, Ola Fosheim Grøstad 
wrote:
> On Monday, 16 October 2017 at 13:49:50 UTC, Atila Neves wrote:
>> A std::shared_ptr going out of scope can pause the program for 
>> just as long as a GC mark-and-sweep.
>
> I don't use shared_ptr much, but why would a single shared_ptr 
> be that slow?

It wouldn't.

It's when you have a shared_ptr to an object that has a 
shared_ptr to an object that has a ... (or unique_ptrs along the 
way).

I saw a paper on this once but my google fun is failing me.

Atila