{
    package WithMXMS_immutable;

    use Moose;
    use MooseX::Method::Signatures;

    method gndn {}

    __PACKAGE__->meta->make_immutable;
}

use v5.14;
use Time::HiRes qw(time);

my $Runs = 15_000;

{
    my $obj = WithMXMS_immutable->new;
    my $start = time;
    $obj->gndn for 1..$Runs;
    my $end = time;
    say +($end - $start)." seconds for MooseX::Method::Signatures method call (immutable)";
}