Serhiy Storchaka added the comment:

> I think the lru_cache should be kept if possible (i.e. I'm -0.5 on your 
> patch).

This patch is only to show the upper level to which should be sought.  I tried 
to optimize lru_cache(), but got only 15%.  I'm afraid that serious 
optimization is impossible 
without rewriting lru_cache() on C.

>   2) avoid using it for regular expressions compiled with re.compile;

I do not see how it can significantly affect performance.


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