WP Slow – Memory Viewer – loop_end

Hi everyone!
I’ve just registered on this forum, because I’m learning the world around wordpress..

So far, I love it!
But I’,m having some issues related to the performance (page really slow to load).
My page is running on localhost, so this is freaking me out..
I’ve been reading but I couldn’t find the reason.
I deactivated all my plugins and erase all the media images. Nothing changes.
So I decided to follow an advice and installed the memory viewer plugin.

The result shows that it takes 9 segs to load the page, 3.3 and 4.3 on loop_end.
So I guess my problem is related with the_loop, right?

this is the way a make the loop (and i have 2 loops per page):

<?php if ( have_posts() ) :
	query_posts('tag=ultimos&posts_per_page=4&orderby=rand');
	while ( have_posts() ) : the_post(); ?>

does anyone knows how can I solve this issue?
thanks in advance