cmpthese 5e7, {
    1 => sub { my $x = 1 + 1; return },
    2 => sub { my $x = 1 + 1; () },
    3 => sub { my $x = 1 + 1; _: },
};

1 27367269/s   -- -13% -22%
2 31367629/s  15%   -- -11%
3 35161744/s  28%  12%   --