ob_start();
define('_START', microtime());
include 'index.php';
define('_FINISH', microtime());
list($secs, $usecs) = explode(' ', _START);
$start = $secs + $usecs;
list($secs, $usecs) = explode(' ', _FINISH);
$finish = $secs + $usecs;
$time = $finish - $start;
$page = ob_get_clean();
echo "It took $time seconds to generate this page";
$echo $page;