On your computer?

No!

#! perl -slw
use strict;

our $N //= 10e6;

my %hash;
my $val = 'AAAAA';

undef $hash{ $val++ } for 1 .. $N;

my $start = time;

open SORT, '| sort > sorted' or die $!;
print SORT $_ while $_ = each %hash;
close SORT;

undef %hash;

open IN, '<', 'sorted' or die $!;
chomp(), $hash{ $_ } = $. while <IN>;
close IN;

my $elapsed = time - $start;

printf "Took %.6f seconds for $N items (%.5f per second)\n",
    $elapsed, $elapsed / $N;


__END__
C:\test>junk41 -N=10e6
Took 225.000000 seconds for 10e6 items (0.00002 per second)
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