timethese(-70, {
  and => 'my $m=0; for(@nums){if ($_ and $_>2) {$m++}}',
  or => 'my $f=0; for(@nums){if (($_||0)>2) {$f++}}',
  def => 'my $n=0; for(@nums){if (defined $_ and $_>2) {$n++}}',
  base => 'my $q=0; for(@nums){if ($_>2) {$q++}}'
});

This produced:
Benchmark: running and, base, def, or, each for at least 45 CPU seconds...
       and: 49 wallclock secs (47.71 usr +  0.05 sys = 47.76 CPU) @ 6077.60/s (n=290266)
      base: 44 wallclock secs (44.82 usr +  0.18 sys = 45.00 CPU) @ 6205.20/s (n=279234)
       def: 47 wallclock secs (44.96 usr +  0.04 sys = 45.00 CPU) @ 6034.82/s (n=271567)
        or: 45 wallclock secs (45.00 usr +  0.02 sys = 45.02 CPU) @ 6034.41/s (n=271669)