There were some optimisations done in https://bugs.python.org/issue26219
>> Would it be OK if we add this to 3.7beta2?
> It's up to the release manager, but personally it feels like you're pushing too hard. Since you've done that frequently in the past I think we should help you by declining your request. 3.8 is right around the corner (on a Python release timescale) and this will give people a nice incentive to upgrade. Subsequent betas exist to stabilize the release, not to put in more new stuff.
>PS. I like you a lot but there's no way I'm going to "bare" with you. :-)