Hashes are OK for any number of keys until you run out of memory
That's not actually universally true--large numbers of hash keys trigger pathological behaviour on many versions of glibc. The bug's been fixed, but a lot of those systems are still out there because people are understandably loathe to update such a fundamental part of their system.

In reply to Re: Re: Re: Re: Re: Slowness when inserting into pre-extended array by Elian
in thread Slowness when inserting into pre-extended array by ryangabbard

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