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Thank you for your answer.
Seems I found original discussion
and it seems that was just optimization of previous algorithm overhead:
Perl currently has a defense against attacks on its hash algorithm where it conditionally enables the use of a random hash seed when it calculates the hash value for a string. This mode is triggered by encountering an overly long bucket chain during insert. Once this bit is set all further hash operations have to go through additional layers of logic. All of this support has a per-operation cost.
The rehash mechanism more or less works around the problem of hash order expectations by only enabling the randomization in degenerate hashes. But it achieves this at the cost of added per operation overhead in hot code paths and additional complexity in the code.

In reply to Re^6: Truly randomized keys() in perl 5.17 - a challenge for testing? by vsespb
in thread Truly randomized keys() in perl 5.17 - a challenge for testing? by saintmike

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