Larry Hastings <la...@hastings.org> added the comment:

> The problem with having a single immortal `None`, is that it will
> cause data cache thrashing as two different CPUs modify the
> refcount on the shared `None` object.

That's a very reasonable theory. Personally, I find modern CPU architecture 
bewildering and unpredictable.  So I'd prefer it if somebody tests such 
performance claims, rather than simply asserting them and having that be the 
final design.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39511>
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