perl -e 'while ($s=<*>) { print $s,"\n"; sleep 5 }'
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As you can see a glob can read filenames one file at a time (hopefully perl really buffers the filenames in the background and doesn't read them in all at once). You might change it to something like this:

use strict;
use warnings;

my @files;
my $filecount=0;
while (my $s=<*>) {
  push @files, $s;
  if (++$filecount>=100) {
    DoTheMoveWith(@files);
    $filecount=0;
  }
}
DoTheMoveWith(@files) if (@files);
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