For Pinterest I use:
<a target="_blank" href="http://pinterest.com/pin/create/button/?url=URL-HERE&media=IMG-SRC-HERE&description=DESCRIPTION-HERE" class="pin-it-button" count-layout="horizontal" title="Share on Pinterest">Share on Pinterest</a>
These, I did for WP quite ago: http://www.teodora-dev.com/wordpress/easy-wordpress-social-sharing-links/
Hope that helps, will be interested to find out if they add to the site speed. (although I would say they shouldn't).
I prefer the old FB referrer path, too