testuser@linux-mint:~$ cat just_map.pl 
use strict;
use warnings;

my @biglist = (1..10000000);
my @squared_big_list = map { $_ * $_ } @biglist;

testuser@linux-mint:~$ time perl just_map.pl 

real	0m1.743s
user	0m1.496s
sys	0m0.248s



testuser@linux-mint:~$ cat mce_map.pl 
use strict;
use warnings;
use MCE::Map;

my @biglist = (1..10000000);
my @squared_big_list = mce_map { $_ * $_ } @biglist;

testuser@linux-mint:~$ time perl mce_map.pl 

real	0m5.401s
user	0m16.008s
sys	0m4.658s
testuser@linux-mint:~$