It seems Imager::Font has some memory leak. On my system, I can only create about 1080 fonts at a time. That's why I use this with perl mkhtml >> index.html, and start it over 6 times. My ttf library has >5000 fonts.

#!/usr/bin/perl -w
use strict;

use Font::TTF::Font;
use Imager qw(:handy);

my $b = NC(0,0,0);
my $w = NC(255, 255, 255);

my $s ="The quick brown fox jumps over the lazy dog. 0123456789 {[()]}
+ @%&*?!";
my $e = 0;
opendir D, '.';
while (defined(my $f = readdir D)) {
    next if $f !~ /ttf$/i;
    next if -e "$f.jpg";
    print STDERR "$f\n";
    my $n = Font::TTF::Font->open($f) || $f;
    $n = $n->{name} || $f if ref $n;
    $n = $n->read->find_name(4) || $f if ref $n;
    my $F = NF(file => $f, aa => 1) or $e++,print(STDERR $Imager::ERRS
+TR),next;
    my @b = $F->bounding_box(string => $s);
    my ($x, $y) = ($b[2] - $b[0], $b[3] - $b[1]);
    my $i = Imager->new(xsize => $x, ysize => $y) or next;
    $i->box(filled => 1, color => $w);
    $i->string(font => $F, string => $s, x => $b[0], y => $b[3], color
+ => $b);
    $i->write(file => "$f.jpg");
    print qq{$f - $n<br><img src="$f.jpg" alt="$f" width=$x height=$y>
+<hr>\n};
}
print STDERR "Failed: $e\n"
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