use Benchmark 'cmpthese';

sub get_value {
        my $self = shift;
        return $self->[0];
}

sub get_value2 {
        $_[0]->[0];
}

my $self = bless [123], '::main';

cmpthese( 16000000, {
        normal    => sub { $self->get_value() },
        optimized => sub { $self->get_value2() },
        direct    => sub { $self->[0] },
});

exit(0);

$ perl oo_benchmark.pl 
                Rate    normal optimized    direct
normal     1462523/s        --      -21%      -90%
optimized  1858304/s       27%        --      -88%
direct    15238095/s      942%      720%        --