I read an article (which I didn't save) that argued you can improve the performance of your site by changing all file paths to full paths, so for instance, instead of
<img src="<?php bloginfo('template_directory'); ?>/images/headers/image.jpg" /> we go with
<img src="http://domain.com/.../images/headers/image.jpg" />.
My platform has its own theme, meaning that it will only be updated if we update it. So changing paths should not be an issue. Also, the article suggested that you do the same type of changes everywhere, e.g. script files,
functions.php, plugins (if you can be bothered to redo it every time they update...).
So the question is, how much performance will this improve? Surely sending less requests on a page load should make some very minor, but noticeable, improvement?