My previous posts have hard-coded HTML code to use timthumb.php to display images.
I learnt I shouldn't use timthumb.php because it slows down web server a lot, so I added following code in the beginning of timthumb.php
$pic = $_GET['src'];
header("location: ".$pic);
die();
However, from my observation in htop, my web server (a VPS) load is still very heavy. My site is based on Wordpress with 20k-30k PV per day. Usually my web server could take much heavier load, but now it seems not. The only difference I could think of is timhumb.php.
Does it make that much difference? Any suggestions?