Recently I was developing Wordpress based news portal. There I faced the problem of Wordpress speed and stability on websites having tons of pages and visitors. Thus I needed to investigate this problem. Finally I found 3 ways to speed up Wordpress based website.

One way is to disable a few plugins, and see if this makes any difference to your load time

use different browser. may be it solve your problem.

Have you tried browsing it with the other browsers? or maybe the browser it self is the problem.

What browser you using for check speed up?
Insert in your template this code

<?php echo $wpdb->num_queries; ?> <?php _e('queries'); ?>

and you will see number of database queries created by your WP.
After that try to reduce this queries by turning off some plugins and rewriting path to images/scripts/etc without WP commands such a

<?php echo get_settings('home'); ?>

and other.
Hope you understand my post

Thanks for the instruction ElmanF. I will try this one.