PDO rendimiento

php

<?php

class User {

	private $matricula;
	private $marca_id;

	public function __construct($matricula, $marca_id)
	{
		$this->matricula = $matricula;
		$this->marca_id = $marca_id;
	}

	public function display() {
		$cosa = 1;
		echo $this->matricula . ' -- ' . $this->marca_id . "\r";
	}

}

function metodoAntiguo(&$sq) {
	$result = $sq->fetchAll();
	$collection = array();
	foreach($result as $r) {
		$collection[] = new User($r['matricula'], $r['marca_id']);
	}
	foreach ($collection as $r) {
		$r->display();
	}
}

function metodoNuevo(&$sq) {
	$result = $sq->fetchAll(PDO::FETCH_CLASS | PDO::FETCH_PROPS_LATE, 'User', array(null, null));
	foreach ($result as $r) {
		$r->display();
	}
}

$dns = 'mysql:host=localhost;dbname=pruebas';
$user = 'root';
$pass = '';

$db = new PDO($dns, $user, $pass);
/*
for($i = 1; $i < 5000; ++$i) {
	$sql = "INSERT INTO stock_tienda (matricula, marca_id) VALUES ('AAA" . $i . "', " . rand(1, 500) . ")";
	$db->exec($sql);
}
*/
$sql = "SELECT matricula, marca_id FROM stock_tienda";

$total_time = 0;

	if($argv[1] == 1) {
		echo "Metodo Antiguo" . PHP_EOL;
	} elseif($argv[1] == 2) {
		echo "Metodo Nuevo" . PHP_EOL;
	} else {
		die('Error... Necesito un argumento');
	}


for($i = 1; $i <= 20; $i++) {
	$sq = $db->query($sql);
	$time_start = microtime(true);

	if($argv[1] == 1) {
		metodoAntiguo($sq);
	} elseif($argv[1] == 2) {
		metodoNuevo($sq);
	}
	
	$time_end = microtime(true);
	$time = $time_end - $time_start;

	$total_time = $total_time + $time;
}

echo ($total_time / $i) . " segundos de media\n";