use strict;
use warnings;
use Imager::Heatmap;
use PDL;

my @insert = sample_data();

$| = 1; print "Generating GIF frame ";

my %size = (xsize => 300, ysize  => 300);
my $t0 = time;
my @hms = map {
  my $h = Imager::Heatmap->new(%size, xsigma => $_, ysigma => $_);
  $h->insert_datas(@insert);
  print ".";
  $h;
} 1..90;
print " time now=", time - $t0;
my $all_vals = pdl map $_->matrix, @hms;

# broadcasting version of Imager::Heatmap::draw
use PDL::Graphics::ColorSpace;
my $frame_max = $all_vals->maxover;
$all_vals /= $frame_max->dummy(0); # dims: x*y frame
my $hue = (1 - $all_vals)*240;
my $d = cat($hue, pdl(1), pdl(1))->mv(-1,0); # dims: hsv x*y frame
my $all_hms = (hsv_to_rgb($d) * 255)->byte   # rgb x*y frame
  ->splitdim(1,300);                         # rgb x y frame
# Imager::write_multi
$all_hms->wmpeg('heatmapb.gif');
print " and now=", time - $t0, "\n";

sub sample_data {
  my @insert = ();
  while (<DATA>) {
    chomp; push @insert, [ split /\s+/ ]
  }
  return @insert
}

__DATA__
...