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Message: [QUOTE="sln, post: 4863153"] You keep saying 'Pre-Filter' as if it actually means anything in relation to sort. This is a particular case of sort implentation that has specific logic. There are no multiple sort keys/fields, whatever in this case. The logic still has to be adhered to in as far as this boolean: $h{$a} and $h{$b} exist ===> length($h{$a}) <=> length($h{$a}) $h{$a} exists but $h{$b} doesn't ===> -1 $h{$a} does't exist but $h{$b} does ===> 1 Neither $h{$a} nor $h{$b} exists ===> 0 (I didn't check it, but it looks right.) It doesen't matter if you do it as a pre-filter or all at once. It may look cleaner as a pre-filter, but that don't count for squat as far as speed. The same number of operations have to be performed no matter where the logic is. As far as multi-key/fields sorting, doing it in one pass, regardless of the sort method always is faster. Less runs through the function or block. -sln [/QUOTE]