williamchan04 on "Small size image with extremely long loading time"

HI~
I am trying to call background images using conditional tag for each archive & pages. Somehow, the background images are taking so long to display, I am sure that is my function causing it, but don't know why,
The images are only 900px X400px ,and it's taking 10seconds to load please help =D

<div id="header"  style="background:url(<?php if (in_category(8)) {
				echo '/wp-content/uploads/2013/08/tour_3-011.png';
			}elseif(in_category(4)) { 

				echo '/wp-content/uploads/2013/08/local-011.png';
}>