<?php

$starttime = microtime(true);

$username = 'root';
$password = '';

$dsn = 'mysql:host=127.0.0.1;port=3306;dbname=test';
$db = new PDO($dsn, $username, $password);

for ($i = 0; $i < 1000; $i++)
{
    $db->query('INSERT INTO test (woot) VALUE (' . microtime(true) . ')');
}

echo microtime(true) - $starttime;
echo PHP_EOL;
$starttime = microtime(true);

$statement = $db->prepare('INSERT INTO test (woot) VALUE (?)');

for ($i = 0; $i < 1000; $i++)
{
    $statement->execute(array(microtime(true)));
}

echo microtime(true) - $starttime;

?>