You can time it by adding code at top and bottom of your php files:
Code at top
PHP Code:
function getmicrotime(){
list($usec, $sec) = explode(" ",microtime());
return ((float)$usec + (float)$sec);
}
$time_start = getmicrotime();
Code at Bottom
PHP Code:
$time_end = getmicrotime();
$timetaken = $time_end - $time_start;
echo $timetaken;