On May 22, Zhenhai Duan said:

I am wondering if the performance (time efficiency) of hash of hash is bad. I has this impression from the code I developed. Basically my structure needs to hold the members of different groups. I have different choices:

hash of hash
$groups{$g1}{$member1} = 1;
but this one is really slow from what i see.

How have you seen this to be slow?

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