Thanks for suggestions! Results:

"%hash = ();" appears to do much the same as undef(), at least, it creates the same long delay.

Iterating all the keys and deleting them is slower than undef, although not by much: around 16 secs as opposed to 14 secs for undef.

So, no solutions there, but thanks for the ideas.

In reply to Re^2: Bug when undefining a large hash by oxone
in thread Bug when undefining a large hash by oxone

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