Question : Perl script taking too long

I have a script that does a lot of sorting based upon a 'simple moving average' which in turn is based upon 100's of arrays. The program is spending a lot of time performing the math. I must speed it up. Here is the code:
------------------
package MAIN;
use strict;

sub simple_moving_avg;

my $length_of_sma = 4;

my @price_array = qw /
    11.3
    11.25
    11.82
    11.64
    11.19
    11.48
    11.37
    10.84
    10.51
    10.76
    10.8
    11.25
    11.36
    11.34
    11.59
    11.41
    11.18
    11.11
    11.72
    11.57
/;

foreach my $i (@price_array) {
    print "i: $i\n";
}
my $sma = 0;
for (my $count = 100000; $count >= 1; $count--) {     # pops of 4 values "$length_ma"
    $sma = simple_moving_avg(\@price_array,$length_of_sma);
}

print "Simple moving avg: $sma\n";
exit;

sub simple_moving_avg {
    my $pointer_array = $_[0];
    my $length_ma     = $_[1];
    my $sum = 0;
    my @tmp = @$pointer_array;
   
    for (my $count = $length_ma; $count >= 1; $count--) {
        my $value = pop (@tmp);
        if (defined $value) {
            $sum = $value + $sum;
        }
    }
    my $ma = sprintf("%.2f",($sum / $length_ma));
    return $ma;
}
--------------------------
Here is the result from running DProf:

Total Elapsed Time = 1.987965 Seconds
  User+System Time = 2.194965 Seconds
Exclusive Times
%Time ExclSec CumulS #Calls sec/call Csec/c  Name
 108.   2.377  2.377 100000   0.0000 0.0000  MAIN::simple_moving_avg
 0.00       - -0.000      1        -      -  strict::import
 0.00       - -0.000      1        -      -  main::BEGIN
 0.00       - -0.000      1        -      -  strict::bits
 0.00       - -0.000      1        -      -  MAIN::BEGIN
--------
My question is: Can this perl subroutine be improved upon (the ExclSec needs to be cut by at least 50%)? I am unable to modify the array being passed into the sub. If the code can not be significantly improved upon would it be faster to call a C++ program (I am learning C++) or assembler? What would that code be? Many thanks.

Answer : Perl script taking too long

sub simple_moving_avg{
    my ($pointer_array,$length_ma)=@_;
    my $sum = 0;
    $sum += $_ for @{$pointer_array}[0..$length_ma-1];
    return sprintf"%.2f",$sum / $length_ma;
}