MODX Revo 2.2.5, PDO

<?php
$time_start = microtime(true);
$c = $modx->newQuery('modResource');
$c->select(array('id','pagetitle','longtitle','content'));
$c->where(array('id:>=' => 6));

$c->limit(1000);

if($c->prepare() && $c->stmt->execute()) {
    $collection = $c->stmt->fetchAll(PDO::FETCH_ASSOC);
}

$output = array();
$i=0;
foreach ($collection as $res) {
    $output[] = $modx->getChunk('tpl',$res);
    $i++;
}

$output = implode("\n",$output);

echo $output;

$time_end = microtime(true);
$time = $time_end - $time_start;
echo 'Ресурсов: ' . $i . '<br />';
echo 'Памяти скушано: ' . round(memory_get_peak_usage(true)/(1024*1024),2) . 'Мб<br />';
echo 'Время работы сниппета ' . $time . ' сек <br />';