let me extend your benchmark with an entry for Sort::Key: 

...
use Sort::Key qw(ikeysort);
sub SortKey {
    my @sorted_keys = ikeysort { $hash{$_}[0] } keys %hash;
}

cmpthese(10, { BrowserUK => \&BrowserUK,
           packed_default => \&packed_default,
           SortKey => \&SortKey });
__end__

                 Rate      BrowserUK packed_default        SortKey

BrowserUK      50.0/s             --           -30%           -45%
packed_default 71.4/s            43%             --           -21%
SortKey        90.9/s            82%            27%             --

[download]
BTW, in my computer the difference between packed and BrowserUK method is not so big as on your test.

In reply to Re^2: Sorting a hash of arrays based on a particular array element. by salva
in thread Sorting a hash of arrays based on a particular array element. by aditya.singh

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